diff --git a/Complete/App.xaml b/Complete/App.xaml
new file mode 100644
index 0000000..1093c01
--- /dev/null
+++ b/Complete/App.xaml
@@ -0,0 +1,8 @@
+<Application x:Class="SudokuWeek4.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="Views\MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>
diff --git a/Complete/App.xaml.cs b/Complete/App.xaml.cs
new file mode 100644
index 0000000..77619ef
--- /dev/null
+++ b/Complete/App.xaml.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Windows;
+
+namespace SudokuWeek4
+{
+	public partial class App : Application
+	{
+	}
+}
diff --git a/Complete/Libraries/Sudoku.dll b/Complete/Libraries/Sudoku.dll
new file mode 100644
index 0000000..925b872
Binary files /dev/null and b/Complete/Libraries/Sudoku.dll differ
diff --git a/Complete/Libraries/register.bat b/Complete/Libraries/register.bat
new file mode 100644
index 0000000..f54409a
--- /dev/null
+++ b/Complete/Libraries/register.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Complete/Libraries/unregister.bat b/Complete/Libraries/unregister.bat
new file mode 100644
index 0000000..74dc2c7
--- /dev/null
+++ b/Complete/Libraries/unregister.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 /u  E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Complete/Models/BoardModel.cs b/Complete/Models/BoardModel.cs
new file mode 100644
index 0000000..3c38b6b
--- /dev/null
+++ b/Complete/Models/BoardModel.cs
@@ -0,0 +1,551 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using System.Windows.Controls.Primitives;
+
+namespace SudokuWeek4.Models
+{
+    public partial class BoardModel
+    {
+        // Define an array to hold the bigCells
+        private LargeCell[,] bigCells;
+
+        // Define an array to hold the smallCells
+        private LittleCell[,] smallCells;
+
+        // Define the current X position
+        private int currentX = 0;
+
+        // Define the current Y position
+        private int currentY = 0;
+
+        // This property will get or set the cheatmode
+        public static Boolean CheatMode { get; set; }
+
+        // Define the gameFieldSize
+        public static int GameFieldSize;
+
+        // Define the gameFieldCount
+        public static int GameFieldCount;
+
+        // Define the GameField
+        private UniformGrid _gameField = new UniformGrid();
+
+        // Define the sodukuGame (if the DLL is enabled)
+        private Sudoku.IGame _sudokuGame;
+
+        // Create a dictionary that holds the cheatDicisions
+        private readonly Dictionary<IntegerPoint, int> _cheatDictionary = new Dictionary<IntegerPoint, int>();
+
+        // Define if the sudokuDLL is used
+        private Boolean _sudokuDLL = true;
+
+        // Define a gameFinished boolean
+        private Boolean _gameFinished = false;
+
+        private int _inputCount;
+
+        public BoardModel()
+        {
+            // Just keep smiling ^_^
+        }
+
+        // This property will get the gameField
+        public UniformGrid GameField
+        {
+            get { return _gameField; }
+        }
+
+        // This method will set the cheatmode
+        public void Cheat(Boolean cheatMode = false)
+        {
+            CheatMode = cheatMode;
+            RefreshAllCells();
+        }
+
+        // Refresh all the cells on the gameField
+        public void RefreshAllCells()
+        {
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    smallCells[x, y].Refresh();
+                }
+            }
+        }
+
+        public void Reset(int gameFieldSize = 3)
+        {
+            // Clear the gameField
+            GameField.Children.Clear();
+
+            // Reset the inputCount
+            _inputCount = 0;
+
+            // Reset the game Finished Boolean
+            _gameFinished = false;
+
+            // Set the boardCount
+            GameFieldCount = gameFieldSize;
+
+            // Set the boardSize
+            GameFieldSize = GameFieldCount * GameFieldCount;
+
+            // Create all the gameField columns (depending on GameFieldSize)
+            GameField.Columns = GameField.Rows = GameFieldCount;
+
+            // Create all the big cells (2D array of gamefield size)
+            bigCells = new LargeCell[GameFieldCount, GameFieldCount];
+
+            // Create the gameField
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                // Create a new border
+                Border border = new Border();
+
+                // Set the border thickness
+                border.BorderThickness = new Thickness(1);
+
+                // Set the borderBrush color
+                border.BorderBrush = Brushes.Blue;
+
+                // Add the border to the gameField
+                GameField.Children.Add(border);
+
+                // Create a bigCell
+                LargeCell bigCell = new LargeCell();
+
+                // Add the bigCell as a child to the created border
+                border.Child = bigCell;
+
+                // Set the bigcells relative to the gameField size
+                bigCells[i % GameFieldCount, i / GameFieldCount] = bigCell;
+            }
+
+            // Load all the small cells
+            LoadAllSmallCells();
+
+            // Clear all the filled in values
+            _cheatDictionary.Clear();
+        }
+
+        // Load all the smallCells
+        private void LoadAllSmallCells()
+        {
+            // Check if the selected gameMode is for 3 x 3  (if not we need to disable the sudoku DLL)
+            if (GameFieldCount != 3)
+            {
+                _sudokuDLL = false;
+                MessageBox.Show("This gamemode cannot be played with the sudoku DLL. SudokuDLL unloaded");
+            }
+            // If the sudoDLL is used we need to create a game
+            if (SudokuDLL)
+            {
+                try
+                {
+                    _sudokuGame = new Sudoku.Game();
+                    _sudokuGame.create();
+                    Console.WriteLine("Sudoku DLL loaded successfully");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine("Error while loading sudoku DLL: \n\n" + ex.Message + "\n\n");
+                    SudokuDLL = false;
+                }
+            }
+
+            // Create the new smallCells
+            smallCells = new LittleCell[GameFieldSize, GameFieldSize];
+
+            // Reset the current X and Y position (Selected cell)
+            currentX = 0;
+            currentY = 0;
+
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    smallCells[x, y] = bigCells[x / GameFieldCount, y / GameFieldCount][x % GameFieldCount, y % GameFieldCount];
+                    smallCells[x, y].X = x;
+                    smallCells[x, y].Y = y;
+                }
+            }
+
+            // If the sudoku DLL is loaded we need to fill in the gameField
+            if (SudokuDLL)
+            {
+                FillSudokuFields();
+            }
+
+
+            /*  // Check array contents
+              Console.WriteLine("Soduku DLL contents: \n\n -------------------------------\n\n");
+              for (int x = 1; x <= GameFieldSize; x++)
+              {
+                  for (int y = 1; y <= GameFieldSize; y++)
+                  {
+                      int sudokuValue;
+                      _sudokuGame.get(x, y, out sudokuValue);
+                      Console.Write(sudokuValue);
+                      if (sudokuValue == -1)
+                      {
+                          Console.WriteLine();
+                      }
+                  }
+              } */
+
+
+            smallCells[0, 0].Selected = true;
+        }
+
+        // This method will fill in all the sudokuFields
+        private void FillSudokuFields()
+        {
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    try
+                    {
+                        int sudokuValue;
+                        _sudokuGame.get(x + 1, y + 1, out sudokuValue);
+
+                        // Check if the sudoku value is not an empty (0) value
+                        if (sudokuValue > 0)
+                        {
+                            // Set the specified value                        
+                            SetNumber(x, y, sudokuValue, false, true);
+                            _cheatDictionary[new IntegerPoint(x, y)] = sudokuValue;
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine("Error while generating the sudoku field when using the Sudoku DLL: \n\n" + ex.Message + "\n\n");
+                        break;
+                    }
+                }
+            }
+        }
+
+        // This method will solve the sudoku puzzle (partially)
+        public void solvePuzzle(int cellsOver = 0)
+        {
+            for (int i = _inputCount; i < smallCells.Length - cellsOver; i++)
+            {
+                ShowHint();
+                System.Console.WriteLine(i);
+            }
+        }
+
+        // This method will get the current clicked cell
+        public void MouseClicked(object sender, MouseEventArgs click)
+        {
+            /* if (sender != null)
+             {
+                 UniformGrid _grid = sender as UniformGrid;
+                 int _row = (int)_grid.GetValue(Grid.RowProperty);
+                 int _column = (int)_grid.GetValue(Grid.ColumnProperty);
+                 MessageBox.Show(string.Format("Grid clicked at column {0}, row {1}", _column, _row));
+             } */
+        }
+
+        // This method will check what to do if a key is pressed
+        public void KeyPressed(KeyEventArgs e)
+        {
+            // Check if the keys left, right, up or down are pressed
+            if (e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up || e.Key == Key.Down)
+            {
+                // Disable the current selected cell
+                smallCells[currentX, currentY].Selected = false;
+
+                // Check which key is pressed and do the appropriate action
+                switch (e.Key)
+                {
+                    case Key.Left:
+                        currentX = (currentX + GameFieldSize - 1) % GameFieldSize;
+                        break;
+                    case Key.Right:
+                        currentX = (currentX + 1) % GameFieldSize;
+                        break;
+                    case Key.Up:
+                        currentY = (currentY + GameFieldSize - 1) % GameFieldSize;
+                        break;
+                    case Key.Down:
+                        currentY = (currentY + 1) % GameFieldSize;
+                        break;
+                }
+
+                // Set the current (new) cell to be selected
+                smallCells[currentX, currentY].Selected = true;
+            }
+
+            // Check if the numberkeys where pressed
+            if ((e.Key >= Key.D1 && e.Key <= Key.D9) || (e.Key >= Key.NumPad1 && e.Key <= Key.NumPad9))
+            {
+                int number = 0;
+                if (e.Key >= Key.D1 && e.Key <= Key.D9)
+                {
+                    number = e.Key - Key.D0;
+                }
+                else
+                {
+                    number = e.Key - Key.NumPad0;
+                }
+
+                IntegerPoint cellPoint = new IntegerPoint(currentX, currentY);
+
+                // Check if the cheatmode contains the key to be pressed
+                if (_cheatDictionary.ContainsKey(cellPoint))
+                {
+                    // Remove the userinput at the specified location
+                    _cheatDictionary.Remove(cellPoint);
+                }
+
+                // Check if the cheatMode does not contains the pressed numberKey and if the current has a candidate that can be selected
+                if (!_cheatDictionary.ContainsKey(cellPoint) && smallCells[currentX, currentY].CanSet(number))
+                {
+                    if (SetNumber(currentX, currentY, number))
+                    {
+                        _cheatDictionary[cellPoint] = number;
+                    }
+                }
+            }
+
+            if (e.Key == Key.Delete && !smallCells[currentX, currentY].ReadOnly)
+            {
+                // Add the option at the specified column
+                foreach (IntegerPoint cellPoint in GetPointsInColumn(currentX))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                // Add the option at the specified row
+                foreach (IntegerPoint cellPoint in GetPointsInRow(currentY))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                // Add the option at the specified BigCell
+                foreach (IntegerPoint cellPoint in GetPointsInParentBigCell(currentX, currentY))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                smallCells[currentX, currentY].RemoveNumber(smallCells[currentX, currentY].Determined);
+            }
+        }
+
+        // Set the specified number
+        private Boolean SetNumber(int x, int y, int number, Boolean hint = false, Boolean readOnly = false)
+        {
+            if (!_gameFinished)
+            {
+                if (number < 1 || number > GameFieldSize || smallCells[x, y].ReadOnly)
+                {
+                    Console.WriteLine("Cannot set the value: The value is less or greater than the GameField size. (Or the cell is readOnly)\nActual Value: " + number + "\n");
+                    return false;
+                }
+
+                // Remove the option at the specified column
+                foreach (IntegerPoint cellPoint in GetPointsInColumn(x))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Remove the option at the specified row
+                foreach (IntegerPoint cellPoint in GetPointsInRow(y))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Remove the option at the specified BigCell
+                foreach (IntegerPoint cellPoint in GetPointsInParentBigCell(x, y))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Set the userInput on the specified cell
+                smallCells[x, y].MakeDecision(number, hint, readOnly);
+
+                _inputCount++;
+
+                if (_sudokuDLL)
+                {
+                    int canAdapt;
+                    _sudokuGame.set(x + 1, y + 1, number, out canAdapt);
+                }
+
+                if (CheatMode)
+                {
+                    // Check which numbers are still posible to set
+                    FindCheatNumbers(GetPointsInColumn(x));
+                    FindCheatNumbers(GetPointsInRow(y));
+                    FindCheatNumbers(GetPointsInParentBigCell(x, y));
+                }
+
+                // Check if we got a winner
+                if (_inputCount == smallCells.Length)
+                {
+                    if (CheckWinner())
+                    {
+                        _gameFinished = true;
+                        MessageBox.Show("Game finished!");
+                        return false;
+                    }
+                }
+                return true;
+            }
+            return false;
+        }
+
+        // Show a hint
+        public void ShowHint()
+        {
+            if (_sudokuDLL)
+            {
+                int hintPossible, value, x, y;
+                _sudokuGame.hint(out hintPossible, out x, out  y, out value);
+                
+                if (hintPossible == 1)
+                {
+                    // Todo: We need to decrease the inputCount if the hint overrides a value that was already set
+                    SetNumber(--x, --y , value, true);
+                }
+            }
+        }
+
+        // Save the game
+        public void Save()
+        {
+            if (_sudokuDLL)
+            {
+                int write;
+                _sudokuGame.write(out write);
+
+                if (write == 1)
+                {
+                    MessageBox.Show("File has been saved succesfully");
+                    RefreshAllCells();
+                }
+            }
+        }
+
+        // Load the game
+        public void Load()
+        {
+            if (_sudokuDLL)
+            {
+                int read;
+                _sudokuGame.read(out read);
+
+                if (read == 1)
+                {
+                    MessageBox.Show("File has been loaded succesfully");
+                    RefreshAllCells();
+                }
+            }
+        }
+
+        public Boolean CheckWinner()
+        {
+            int endGame;
+            _sudokuGame.isValid(out endGame);
+            return endGame == 1;
+        }
+
+        // Find the numbers that can be set (Cheat mode)
+        private void FindCheatNumbers(List<IntegerPoint> optionPoints)
+        {
+            try
+            {
+                Dictionary<int, int> dictionaryCount = new Dictionary<int, int>();
+                for (int i = 1; i <= GameFieldSize; i++)
+                {
+                    dictionaryCount[i] = 0;
+                }
+
+                foreach (IntegerPoint optionPoint in optionPoints)
+                {
+                    foreach (int option in smallCells[optionPoint.X, optionPoint.Y].Options)
+                    {
+                        dictionaryCount[option]++;
+                    }
+                }
+
+                foreach (int cell in (from keys in dictionaryCount.Keys where dictionaryCount[keys] == 1 select keys).ToArray())
+                {
+                    foreach (IntegerPoint cellPoint in optionPoints)
+                    {
+                        if (smallCells[cellPoint.X, cellPoint.Y].CanSet(cell))
+                            smallCells[cellPoint.X, cellPoint.Y].SetPossible(cell);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+        }
+
+        // Get the current points that where set in the bigCell
+        private static List<IntegerPoint> GetPointsInParentBigCell(int x, int y)
+        {
+            int x0 = x - x % GameFieldCount;
+            int y0 = y - y % GameFieldCount;
+
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(x0 + i % GameFieldCount, y0 + i / GameFieldCount));
+            }
+            return cellPoints;
+        }
+
+        // Get the current points that where set in the current row
+        private static List<IntegerPoint> GetPointsInRow(int y)
+        {
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(i, y));
+            }
+            return cellPoints;
+        }
+
+        // Create a property to check if the sudokuDLL is used
+        public Boolean SudokuDLL
+        {
+            get { return _sudokuDLL; }
+            set
+            {
+                _sudokuDLL = value;
+                Reset(GameFieldCount);
+            }
+        }
+
+
+        // Get the current points that where set in the current column
+        private static List<IntegerPoint> GetPointsInColumn(int x)
+        {
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(x, i));
+            }
+            return cellPoints;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Complete/Models/Constants.cs b/Complete/Models/Constants.cs
new file mode 100644
index 0000000..f6172ee
--- /dev/null
+++ b/Complete/Models/Constants.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models
+{
+    public static class Constants
+    {
+        public static Color DefaultSmallCellFontColor = Colors.Green;
+        public static Color DefaultSmallCellReadOnlyFontColor = Colors.Red;
+        public static Color DefaultSmallCellHintFontColor = Colors.Orange;
+
+        public static Color CheatActivedFontColor = Colors.Blue;        
+
+    }
+}
diff --git a/Complete/Models/Converters/BackgroundValueConverter.cs b/Complete/Models/Converters/BackgroundValueConverter.cs
new file mode 100644
index 0000000..c00bd47
--- /dev/null
+++ b/Complete/Models/Converters/BackgroundValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class BackgroundValueConverter : IValueConverter
+    {
+        private static readonly BackgroundValueConverter _instance = new BackgroundValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Boolean && targetType == typeof(Brush))
+            {
+                Boolean color = (Boolean)value;
+                if (color)
+                    return Brushes.Red;
+                else
+                    return Brushes.Transparent;
+            }
+
+            // The type is not a brush
+            return null;
+        }
+
+        // Create a property to get the instance of the BackgroundValue
+        public static BackgroundValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Complete/Models/Converters/BorderValueConverter.cs b/Complete/Models/Converters/BorderValueConverter.cs
new file mode 100644
index 0000000..b03a8e4
--- /dev/null
+++ b/Complete/Models/Converters/BorderValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class BorderValueConverter : IValueConverter
+    {
+        private static readonly BorderValueConverter _instance = new BorderValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Boolean && targetType == typeof(Brush))
+            {
+                Boolean color = (Boolean)value;
+                if (color)
+                    return Brushes.Orange;
+                else
+                    return Brushes.Transparent;
+            }
+
+            // The type is not a brush
+            return null;
+        }
+
+        // Create a property to get the instance of the BorderValue
+        public static BorderValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Complete/Models/Converters/Number2BrushValueConverter.cs b/Complete/Models/Converters/Number2BrushValueConverter.cs
new file mode 100644
index 0000000..6b99cba
--- /dev/null
+++ b/Complete/Models/Converters/Number2BrushValueConverter.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class Number2BrushValueConverter : IValueConverter
+    {
+        private static readonly Number2BrushValueConverter _instance = new Number2BrushValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is int) || targetType != typeof(Brush))
+                throw new InvalidCastException();
+
+            int number = (int)value;
+            return NumberBrushes.GetBrush(number, (Color)parameter);
+        }
+
+        // Create a property to get the instance of the Number2BrushValue
+        public static Number2BrushValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Complete/Models/Converters/OptionsValueConverter.cs b/Complete/Models/Converters/OptionsValueConverter.cs
new file mode 100644
index 0000000..cfcc3df
--- /dev/null
+++ b/Complete/Models/Converters/OptionsValueConverter.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class OptionsValueConverter : IValueConverter
+    {
+        private static readonly OptionsValueConverter _instance = new OptionsValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is HashSet<int>) || targetType != typeof(Brush) || !(parameter is int))
+                throw new InvalidCastException();
+
+            HashSet<int> set = (HashSet<int>)value;
+            int number = (int)parameter;
+
+            if (set.Contains(number) && BoardModel.CheatMode)
+                return NumberBrushes.GetBrush(number, Constants.CheatActivedFontColor);
+            else
+                return Brushes.Transparent;
+        }
+
+        // Create a property to get the instance of the OptionsValue
+        public static OptionsValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Complete/Models/Converters/VisibilityValueConverter.cs b/Complete/Models/Converters/VisibilityValueConverter.cs
new file mode 100644
index 0000000..ba9d832
--- /dev/null
+++ b/Complete/Models/Converters/VisibilityValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class VisibilityValueConverter : IValueConverter
+    {
+        private static readonly VisibilityValueConverter _instance = new VisibilityValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is bool) || targetType != typeof(Visibility))
+                throw new InvalidCastException();
+
+            bool visible = (bool)value;
+            if (parameter != null)
+                visible =! visible;
+
+            if (visible)
+                return Visibility.Visible;
+            else
+                return Visibility.Hidden;
+        }
+
+        // Create a property to get the instance of the OptionsValue
+        public static VisibilityValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Complete/Models/IntegerPoint.cs b/Complete/Models/IntegerPoint.cs
new file mode 100644
index 0000000..19f1086
--- /dev/null
+++ b/Complete/Models/IntegerPoint.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SudokuWeek4.Models
+{
+	internal struct IntegerPoint
+	{
+		public int X;
+		public int Y;
+
+		public IntegerPoint(int x, int y)
+		{
+			X = x;
+			Y = y;
+		}
+
+        // Check if the given objectPoint is an IntegerPoint
+		public override bool Equals(object objectPoint)
+		{
+			if( objectPoint == null || objectPoint.GetType() != typeof(IntegerPoint) )
+				return false;
+
+			return Equals((IntegerPoint)objectPoint);
+		}
+
+        // Check if the X and Y are equal to eachother
+        public bool Equals(IntegerPoint objectPoint)
+		{
+            return objectPoint.X == X && objectPoint.Y == Y;
+		}
+
+        // We do not need this (just to have all the overrides)
+		public override int GetHashCode()
+		{
+            return 0;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Complete/Models/LargeCell.xaml b/Complete/Models/LargeCell.xaml
new file mode 100644
index 0000000..170c11e
--- /dev/null
+++ b/Complete/Models/LargeCell.xaml
@@ -0,0 +1,6 @@
+<UserControl x:Class="SudokuWeek4.Models.LargeCell"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Padding="1,1,0,0">
+    <UniformGrid Name="bigCellGrid" />
+</UserControl>
diff --git a/Complete/Models/LargeCell.xaml.cs b/Complete/Models/LargeCell.xaml.cs
new file mode 100644
index 0000000..7948e3a
--- /dev/null
+++ b/Complete/Models/LargeCell.xaml.cs
@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.Models
+{
+	public partial class LargeCell : UserControl
+	{
+        // This array will hold the smallCells
+        private LittleCell[,] _littleCells;
+
+        // Create the contructor
+        public LargeCell()
+		{
+            try
+            {
+                InitializeComponent();
+                Initialize();
+            }
+            catch (Exception) {
+                System.Console.WriteLine("Cannot create the largeCell  Sudoku Error.");
+            }
+		}
+
+        // Intialize the game
+		private void Initialize()
+		{
+            // Clear all the contents of the bigCellGrid
+			bigCellGrid.Children.Clear();
+
+            // Set the rows and columns to the size of the gameField
+            bigCellGrid.Columns = bigCellGrid.Rows = BoardModel.GameFieldCount;
+
+            // Create a new array with all the smallCells to the size of the gameField
+            _littleCells = new LittleCell[BoardModel.GameFieldCount, BoardModel.GameFieldCount];
+
+            // Create all the smallCells that will come inside the bigCells
+            for (int i = 0; i < BoardModel.GameFieldSize; i++)
+			{
+				Border border = new Border();
+				border.BorderThickness = new Thickness (1);
+				border.BorderBrush = Brushes.Green;
+				border.Margin = new Thickness (-1, -1, 0, 0);
+				bigCellGrid.Children.Add (border);
+
+				LittleCell smallCell = new LittleCell ();
+				border.Child = smallCell;
+
+                _littleCells[i % BoardModel.GameFieldCount, i / BoardModel.GameFieldCount] = smallCell;
+			}
+		}
+
+        // This property returns the specified SmallCell
+		public LittleCell this[int x, int y]
+		{
+			get { return _littleCells[x, y]; }
+		}
+	}
+}
\ No newline at end of file
diff --git a/Complete/Models/LittleCell.xaml b/Complete/Models/LittleCell.xaml
new file mode 100644
index 0000000..d0ec1a1
--- /dev/null
+++ b/Complete/Models/LittleCell.xaml
@@ -0,0 +1,11 @@
+<UserControl x:Class="SudokuWeek4.Models.LittleCell"
+			 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+			 xmlns:Sudoku="clr-namespace:SudokuWeek4">
+	<Border Name="smallBorder" BorderThickness="4">
+		<Grid>
+			<Grid Name="inputGrid" />
+			<UniformGrid Name="optionsGrid" />
+		</Grid>
+	</Border>
+</UserControl>
diff --git a/Complete/Models/LittleCell.xaml.cs b/Complete/Models/LittleCell.xaml.cs
new file mode 100644
index 0000000..cc60486
--- /dev/null
+++ b/Complete/Models/LittleCell.xaml.cs
@@ -0,0 +1,259 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Media;
+using SudokuWeek4.Models.Converters;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.Models
+{
+    public partial class LittleCell : UserControl, INotifyPropertyChanged
+    {
+        // Define a hashSet of the available options
+        private readonly HashSet<int> _options = new HashSet<int>();
+
+        // Define a hashSet of the possible solutions
+        private readonly HashSet<int> _solutions = new HashSet<int>();
+
+        // Define if the cell is selected
+        private Boolean _selected;
+
+        // This will hold the X and Y position of the cell
+        public int X, Y;
+
+        // Set the cell to be readOnly
+        private Boolean _readOnly;
+
+        // Set the cell fontColor
+        private Color _fontColor;
+
+        // Create a nullable int to check if the cell is already filled-in
+        private int? _inputPlaced;
+
+        // Create the OnPropertyChanged Event
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private void OnPropertyChanged(string name)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(name));
+        }
+
+        // Create the constructor
+        public LittleCell()
+        {
+            InitializeComponent();
+
+            // Set the color to the default color
+            FontColor = Colors.Green;
+
+            // Bind the currently selected cell
+            Binding bind = new Binding("Selected");
+            bind.Source = this;
+            bind.Converter = BorderValueConverter.Instance;
+            smallBorder.SetBinding(Border.BorderBrushProperty, bind);
+
+            // Bind the cell if there is a solution (possible)
+            bind = new Binding("Solution");
+            bind.Source = this;
+            bind.Converter = BackgroundValueConverter.Instance;
+            this.SetBinding(BackgroundProperty, bind);
+
+            // Set the columns and the rows of the Options to the size of the gameField
+            optionsGrid.Columns = optionsGrid.Rows = BoardModel.GameFieldCount;
+            for (int i = 1; i <= BoardModel.GameFieldSize; i++)
+            {
+                Grid child = new Grid();
+                child.Margin = new Thickness(2);
+                optionsGrid.Children.Add(child);
+
+                // Bind the available options to the cells (Cheat Mode)
+                bind = new Binding("Options");
+                bind.Source = this;
+                bind.Converter = OptionsValueConverter.Instance;
+                bind.ConverterParameter = i;
+                child.SetBinding(BackgroundProperty, bind);
+            }
+
+            // Bind if the grid was placed
+            bind = new Binding("Determined");
+            bind.Source = this;
+            bind.ConverterParameter = Constants.DefaultSmallCellFontColor;
+            bind.Converter = Number2BrushValueConverter.Instance;
+            inputGrid.SetBinding(BackgroundProperty, bind);
+
+            // Bind if the inputGrid needs to be visible
+            bind = new Binding("IsDetermined");
+            bind.Source = this;
+            bind.Converter = VisibilityValueConverter.Instance;
+            inputGrid.SetBinding(VisibilityProperty, bind);
+
+            // Bind if the optionsGrid is determined
+            bind = new Binding("IsDetermined");
+            bind.Source = this;
+            bind.Converter = VisibilityValueConverter.Instance;
+            bind.ConverterParameter = 0;
+            optionsGrid.SetBinding(VisibilityProperty, bind);
+
+            Clear();
+        }
+
+        // This property will change the FontColor
+        public Color FontColor
+        {
+            get { return _fontColor; }
+            set { _fontColor = value; }
+        }
+
+        // This function will clear the cell
+        public void Clear()
+        {
+            // Clear all the available options
+            _options.Clear();
+
+            // Add all the available options to the optionsGrid
+            for (int i = 1; i <= BoardModel.GameFieldSize; i++)
+                _options.Add(i);
+
+            _inputPlaced = null;
+            _solutions.Clear();
+            Refresh();
+        }
+
+        // Refresh all the bindings
+        public void Refresh() 
+        {
+            OnPropertyChanged(null);
+        }
+
+        // Create a property to get available Options (CheatMode)
+        public HashSet<int> Options
+        {
+            get { return _options; }
+        }
+
+        // Check if the cell can be set with a number
+        public Boolean CanSet(int number)
+        {
+            if (BoardModel.CheatMode)
+                return _options.Contains(number);
+            else
+                return true;
+        }
+
+        // Remove the number from the specified cell
+        public void RemoveNumber(int number)
+        {
+            _inputPlaced = null;
+            Refresh();
+        }
+
+        // Add the option from the specified cell
+        public void AddOption(int number)
+        {
+            _options.Add(number);
+            Refresh();
+        }
+
+        // Remove the option from the specified cell
+        public void RemoveOption(int number)
+        {
+            _options.Remove(number);
+            Refresh();
+        }
+
+        // Create a property to check if the cell has a number
+        public bool IsDetermined
+        {
+            get { return _inputPlaced.HasValue; }
+        }
+
+        // Create a property to get the current cellNumber
+        public int Determined
+        {
+            get { return _inputPlaced.GetValueOrDefault(); }
+        }
+
+        // This method will make a decision on a specified cell
+        public void MakeDecision(int number, Boolean hint = false, Boolean readOnly = false)
+        {
+            if (!_readOnly)
+            {
+                _inputPlaced = number;
+                _readOnly = readOnly;
+
+                if (readOnly || hint)
+                {
+                    if (readOnly)
+                    {
+                        // Set the color of the font to the readOnly Font
+                        FontColor = Constants.DefaultSmallCellReadOnlyFontColor;
+                    }
+                    else if (hint) 
+                    {
+                        // Set the color of the font to the hint Font
+                        FontColor = Constants.DefaultSmallCellHintFontColor;
+                    }
+
+                    // Rebind the cell (with the new color)
+                    Binding bind = new Binding("Determined");
+                    bind.Source = this;
+                    bind.Converter = Number2BrushValueConverter.Instance;
+                    bind.ConverterParameter = FontColor;
+                    inputGrid.SetBinding(BackgroundProperty, bind);
+                }
+                Refresh();
+            }
+        }
+
+        // Create a property to check if the cell is readOnly
+        public Boolean ReadOnly
+        {
+            get { return _readOnly; }
+        }
+
+        // Create a property to check if there is a solution
+        public Boolean Solution
+        {
+            get
+            {
+                if (!BoardModel.CheatMode)
+                    return false;
+
+                if (_inputPlaced.HasValue)
+                    return false;
+
+                if (_solutions.Count > 1)
+                    return true;
+
+                return _options.Count == 0;
+            }
+        }
+
+        // Set the specified cell to a possible solution
+        public void SetPossible(int cell)
+        {
+            _solutions.Add(cell);
+            Refresh();
+        }
+
+        // Create a property to check which cell is selected
+        public Boolean Selected
+        {
+            get { return _selected; }
+            set
+            {
+                if (value != _selected)
+                {
+                    _selected = value;
+                    OnPropertyChanged("Selected");
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Complete/Models/NumberBrushes.cs b/Complete/Models/NumberBrushes.cs
new file mode 100644
index 0000000..14b02a5
--- /dev/null
+++ b/Complete/Models/NumberBrushes.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Windows;
+using System.Windows.Media;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4
+{
+	internal static class NumberBrushes
+	{
+        // Create a dictionary for the cached brushes (per cell)
+		private static readonly Dictionary<string, DrawingBrush> cachedBrushes = new Dictionary<string, DrawingBrush>();
+
+		public static DrawingBrush GetBrush(int number, Color colorBrush)
+		{
+            // Check if the index is out of bounds
+            if (number < 0 || number > BoardModel.GameFieldSize)
+				throw new IndexOutOfRangeException();
+
+			// Get the cached brush (if exists)
+            string key = number + colorBrush.ToString();
+			DrawingBrush brush;
+
+			if (cachedBrushes.TryGetValue(key, out brush))
+				return brush;
+
+			// Create a new brush (not in cache)
+			FormattedText formtxt = new FormattedText(number.ToString(), CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("Times New Roman"), 100, Brushes.Black);
+			Geometry textGeometry = formtxt.BuildGeometry(new Point(0, 0));
+            brush = new DrawingBrush(new GeometryDrawing(new SolidColorBrush(colorBrush), null, textGeometry));
+			brush.Stretch = Stretch.Uniform;
+
+			cachedBrushes[key] = brush;
+			return brush;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Complete/Properties/AssemblyInfo.cs b/Complete/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..aca0baf
--- /dev/null
+++ b/Complete/Properties/AssemblyInfo.cs
@@ -0,0 +1,55 @@
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle( "Sudoku" )]
+[assembly: AssemblyDescription( "" )]
+[assembly: AssemblyConfiguration( "" )]
+[assembly: AssemblyCompany("SuperSmash")]
+[assembly: AssemblyProduct( "Sudoku" )]
+[assembly: AssemblyCopyright("Copyright © SuperSmash 2012")]
+[assembly: AssemblyTrademark( "" )]
+[assembly: AssemblyCulture( "" )]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible( false )]
+
+//In order to begin building localizable applications, set 
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+	ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+	//(used if a resource is not found in the page, 
+	// or application resource dictionaries)
+	ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+	//(used if a resource is not found in the page, 
+	// app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]
diff --git a/Complete/Properties/Resources.Designer.cs b/Complete/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..d56fec4
--- /dev/null
+++ b/Complete/Properties/Resources.Designer.cs
@@ -0,0 +1,63 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("SudokuWeek4.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+    }
+}
diff --git a/Complete/Properties/Resources.resx b/Complete/Properties/Resources.resx
new file mode 100644
index 0000000..04e2214
--- /dev/null
+++ b/Complete/Properties/Resources.resx
@@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+</root>
\ No newline at end of file
diff --git a/Complete/Properties/Settings.Designer.cs b/Complete/Properties/Settings.Designer.cs
new file mode 100644
index 0000000..9ff9493
--- /dev/null
+++ b/Complete/Properties/Settings.Designer.cs
@@ -0,0 +1,26 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    
+    
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "10.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+        
+        public static Settings Default {
+            get {
+                return defaultInstance;
+            }
+        }
+    }
+}
diff --git a/Complete/Properties/Settings.settings b/Complete/Properties/Settings.settings
new file mode 100644
index 0000000..033d7a5
--- /dev/null
+++ b/Complete/Properties/Settings.settings
@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>
\ No newline at end of file
diff --git a/Complete/Sudoku.csproj b/Complete/Sudoku.csproj
new file mode 100644
index 0000000..d5d79b6
--- /dev/null
+++ b/Complete/Sudoku.csproj
@@ -0,0 +1,238 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>9.0.21022</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{C835CFCA-0A38-40C5-BEA8-3822441B27EC}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>SudokuWeek4</RootNamespace>
+    <AssemblyName>Sudoku</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <ApplicationIcon>
+    </ApplicationIcon>
+    <FileUpgradeFlags>
+    </FileUpgradeFlags>
+    <UpgradeBackupLocation>
+    </UpgradeBackupLocation>
+    <OldToolsVersion>3.5</OldToolsVersion>
+    <PublishUrl>publish\</PublishUrl>
+    <Install>true</Install>
+    <InstallFrom>Disk</InstallFrom>
+    <UpdateEnabled>false</UpdateEnabled>
+    <UpdateMode>Foreground</UpdateMode>
+    <UpdateInterval>7</UpdateInterval>
+    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
+    <UpdatePeriodically>false</UpdatePeriodically>
+    <UpdateRequired>false</UpdateRequired>
+    <MapFileExtensions>true</MapFileExtensions>
+    <ApplicationRevision>0</ApplicationRevision>
+    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <IsWebBootstrapper>false</IsWebBootstrapper>
+    <UseApplicationTrust>false</UseApplicationTrust>
+    <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x86\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Debug\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>false</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <OutputPath>bin\x86\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Release\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>true</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+    <CodeAnalysisIgnoreBuiltInRules>true</CodeAnalysisIgnoreBuiltInRules>
+    <CodeAnalysisFailOnMissingRules>false</CodeAnalysisFailOnMissingRules>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject />
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data.DataSetExtensions">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="UIAutomationProvider">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationCore">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationFramework">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Page Include="Models\LargeCell.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Page Include="Views\MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Page Include="Models\LittleCell.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Models\BoardModel.cs" />
+    <Compile Include="Models\Constants.cs" />
+    <Compile Include="Models\Converters\BackgroundValueConverter.cs" />
+    <Compile Include="Models\Converters\BorderValueConverter.cs" />
+    <Compile Include="Models\Converters\Number2BrushValueConverter.cs" />
+    <Compile Include="Models\Converters\OptionsValueConverter.cs" />
+    <Compile Include="Models\Converters\VisibilityValueConverter.cs" />
+    <Compile Include="ViewModels\MainViewModel.cs" />
+    <Compile Include="Views\MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Models\LargeCell.xaml.cs">
+      <DependentUpon>LargeCell.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Models\IntegerPoint.cs" />
+    <Compile Include="Models\NumberBrushes.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <Compile Include="Models\LittleCell.xaml.cs">
+      <DependentUpon>LittleCell.xaml</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <None Include="app.config" />
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <AppDesigner Include="Properties\" />
+  </ItemGroup>
+  <ItemGroup>
+    <BootstrapperPackage Include="Microsoft.Net.Client.3.5">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1 Client Profile</ProductName>
+      <Install>false</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Windows.Installer.3.1">
+      <Visible>False</Visible>
+      <ProductName>Windows Installer 3.1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\" />
+  </ItemGroup>
+  <ItemGroup>
+    <COMReference Include="Sudoku">
+      <Guid>{FC98639C-8987-42D6-B20C-8BE179AB7C55}</Guid>
+      <VersionMajor>1</VersionMajor>
+      <VersionMinor>0</VersionMinor>
+      <Lcid>0</Lcid>
+      <WrapperTool>tlbimp</WrapperTool>
+      <Isolated>False</Isolated>
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+    </COMReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/Complete/Sudoku.sln b/Complete/Sudoku.sln
new file mode 100644
index 0000000..be91157
--- /dev/null
+++ b/Complete/Sudoku.sln
@@ -0,0 +1,26 @@
+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sudoku", "Sudoku.csproj", "{C835CFCA-0A38-40C5-BEA8-3822441B27EC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.ActiveCfg = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.Build.0 = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.ActiveCfg = Release|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Complete/ViewModels/MainViewModel.cs b/Complete/ViewModels/MainViewModel.cs
new file mode 100644
index 0000000..c2c2205
--- /dev/null
+++ b/Complete/ViewModels/MainViewModel.cs
@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.ViewModels
+{
+    public class MainViewModel
+    {
+        private BoardModel _board;
+        private UniformGrid _gameField;
+
+        public MainViewModel(UniformGrid gameField)
+        {
+            _board = new BoardModel();
+            _gameField = gameField;
+            _gameField.Children.Add(GameField());
+        }
+
+        public void Reset(int boardSize) 
+        {
+            _board.Reset(boardSize);
+        }
+
+        public void Cheat(Boolean cheatMode) 
+        {
+            _board.Cheat(cheatMode);
+        }
+
+        public void ShowHint()
+        {
+            _board.ShowHint();
+        }
+
+        public void Save() 
+        {
+            _board.Save();
+        }
+
+        public void Load()
+        {
+            _board.Load();
+        }
+
+        public UniformGrid GameField()
+        {
+            return _board.GameField;
+        }
+
+        public void EnableDLL(Boolean state) 
+        {
+            _board.SudokuDLL = state;
+        }
+
+        public void SolvePuzzle(int cellsOver = 0) 
+        {
+            _board.solvePuzzle(cellsOver);
+        }
+
+        public void keyPressed(KeyEventArgs key) 
+        {
+            _board.KeyPressed(key);
+        }
+
+        public void mouseClicked(object sender, MouseEventArgs click) 
+        {
+            _board.MouseClicked(sender, click);
+        }
+    }
+}
diff --git a/Complete/Views/MainWindow.xaml b/Complete/Views/MainWindow.xaml
new file mode 100644
index 0000000..be575ab
--- /dev/null
+++ b/Complete/Views/MainWindow.xaml
@@ -0,0 +1,30 @@
+<Window x:Class="SudokuWeek4.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Sudoku="clr-namespace:SudokuWeek4"
+        Title="Week4 - Sudoku" PreviewKeyDown="mainGrid_PreviewKeyDown" PreviewMouseLeftButtonUp="Window_PreviewMouseLeftButtonUp">
+    <DockPanel>
+        <Menu DockPanel.Dock="Top" KeyboardNavigation.DirectionalNavigation="None">
+            <MenuItem Header="Game">
+                <MenuItem Header="Enable Sudoku DLL" Click="MenuItem_EnableDLL" />
+                <MenuItem Header="2x2" Tag="2" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="3x3" Tag="3" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="4x4" Tag="4" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="Enable/Disable CheatMode" Click="MenuItem_CheatMode" />
+                <MenuItem Header="Save game" Click="MenuItem_Save" />
+                <MenuItem Header="Load game" Click="MenuItem_Load" />
+                <MenuItem Header="Quit game" Click="MenuItem_Quit" />
+            </MenuItem>
+            <Separator/>
+            <Separator/>
+            <MenuItem Header="Hint" Click="MenuItem_Hint" />
+            <Separator/>
+            <Separator/>
+            <MenuItem Header="Lazymode">
+                <MenuItem Header="Solve (Partially)" Click="MenuItem_SolvePartially" />
+                <MenuItem Header="Solve (Completely)" Click="MenuItem_Solve" />
+            </MenuItem>            
+        </Menu>
+        <Border BorderBrush="Black" BorderThickness="3" Margin="5">
+            <UniformGrid Name="mainGrid" />
+        </Border>
+    </DockPanel>
+</Window>
\ No newline at end of file
diff --git a/Complete/Views/MainWindow.xaml.cs b/Complete/Views/MainWindow.xaml.cs
new file mode 100644
index 0000000..183d603
--- /dev/null
+++ b/Complete/Views/MainWindow.xaml.cs
@@ -0,0 +1,95 @@
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System;
+using SudokuWeek4.ViewModels;
+using System.Windows.Input;
+
+namespace SudokuWeek4
+{
+	public partial class MainWindow : Window
+	{
+        private int _boardSize = 3;
+        private Boolean _cheatMode = false;
+        private Boolean _sudokuDLL = true;
+        private MainViewModel _mainViewModel;
+
+		public MainWindow()
+		{
+			InitializeComponent();
+            _mainViewModel = new MainViewModel(mainGrid);
+            Reset(_boardSize);
+        }
+
+        // Reset the gameField
+        private void Reset(int boardSize) {
+            _mainViewModel.Reset(boardSize);
+        }
+
+        // Save the game
+        private void MenuItem_Save(object sender, RoutedEventArgs e)
+		{           
+            _mainViewModel.Save();
+		}
+
+        // Load the game
+        private void MenuItem_Load(object sender, RoutedEventArgs e)
+		{
+            _mainViewModel.Load();
+		}
+
+        // Reset the gameField
+		private void MenuItem_ResetBoard(object sender, RoutedEventArgs e)
+		{           
+            Reset(int.Parse(((MenuItem)sender).Tag.ToString()));
+		}
+
+        // Get a hint
+        private void MenuItem_Hint(object sender, RoutedEventArgs e)
+		{           
+            _mainViewModel.ShowHint();
+		}
+
+        // Enable the sudoku DLL
+        private void MenuItem_EnableDLL(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.EnableDLL(_sudokuDLL =! _sudokuDLL);
+        }
+
+        // Solve the sudoku puzzle
+        private void MenuItem_Solve(object sender, RoutedEventArgs e) 
+        { 
+            _mainViewModel.SolvePuzzle();
+        }
+
+        // Solve the sudoku puzzle partially
+        private void MenuItem_SolvePartially(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.SolvePuzzle(2);
+        }
+
+        // Cheat 
+        private void MenuItem_CheatMode(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.Cheat(_cheatMode =! _cheatMode);
+        }
+
+        // Exit the application
+        private void MenuItem_Quit(object sender, RoutedEventArgs e)
+        {
+            Application.Current.Shutdown(1);
+        }
+
+        // This method will check what to do if a key is pressed
+        private void mainGrid_PreviewKeyDown(object sender, KeyEventArgs key)
+        {
+            _mainViewModel.keyPressed(key);
+        }
+
+        private void Window_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs click)
+        {
+            _mainViewModel.mouseClicked(sender, click);
+        }
+	}
+}
\ No newline at end of file
diff --git a/Complete/app.config b/Complete/app.config
new file mode 100644
index 0000000..e365603
--- /dev/null
+++ b/Complete/app.config
@@ -0,0 +1,3 @@
+<?xml version="1.0"?>
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
diff --git a/Sudoku_-_DLL/Libraries/Sudoku.dll b/Sudoku_-_DLL/Libraries/Sudoku.dll
new file mode 100644
index 0000000..925b872
Binary files /dev/null and b/Sudoku_-_DLL/Libraries/Sudoku.dll differ
diff --git a/Sudoku_-_DLL/Libraries/SudokuDLL.dll b/Sudoku_-_DLL/Libraries/SudokuDLL.dll
new file mode 100644
index 0000000..24bafe5
Binary files /dev/null and b/Sudoku_-_DLL/Libraries/SudokuDLL.dll differ
diff --git a/Sudoku_-_DLL/Libraries/register.bat b/Sudoku_-_DLL/Libraries/register.bat
new file mode 100644
index 0000000..f54409a
--- /dev/null
+++ b/Sudoku_-_DLL/Libraries/register.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Sudoku_-_DLL/Libraries/unregister.bat b/Sudoku_-_DLL/Libraries/unregister.bat
new file mode 100644
index 0000000..74dc2c7
--- /dev/null
+++ b/Sudoku_-_DLL/Libraries/unregister.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 /u  E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Sudoku_-_DLL/Models/BoardModel.cs b/Sudoku_-_DLL/Models/BoardModel.cs
new file mode 100644
index 0000000..3c38b6b
--- /dev/null
+++ b/Sudoku_-_DLL/Models/BoardModel.cs
@@ -0,0 +1,551 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using System.Windows.Controls.Primitives;
+
+namespace SudokuWeek4.Models
+{
+    public partial class BoardModel
+    {
+        // Define an array to hold the bigCells
+        private LargeCell[,] bigCells;
+
+        // Define an array to hold the smallCells
+        private LittleCell[,] smallCells;
+
+        // Define the current X position
+        private int currentX = 0;
+
+        // Define the current Y position
+        private int currentY = 0;
+
+        // This property will get or set the cheatmode
+        public static Boolean CheatMode { get; set; }
+
+        // Define the gameFieldSize
+        public static int GameFieldSize;
+
+        // Define the gameFieldCount
+        public static int GameFieldCount;
+
+        // Define the GameField
+        private UniformGrid _gameField = new UniformGrid();
+
+        // Define the sodukuGame (if the DLL is enabled)
+        private Sudoku.IGame _sudokuGame;
+
+        // Create a dictionary that holds the cheatDicisions
+        private readonly Dictionary<IntegerPoint, int> _cheatDictionary = new Dictionary<IntegerPoint, int>();
+
+        // Define if the sudokuDLL is used
+        private Boolean _sudokuDLL = true;
+
+        // Define a gameFinished boolean
+        private Boolean _gameFinished = false;
+
+        private int _inputCount;
+
+        public BoardModel()
+        {
+            // Just keep smiling ^_^
+        }
+
+        // This property will get the gameField
+        public UniformGrid GameField
+        {
+            get { return _gameField; }
+        }
+
+        // This method will set the cheatmode
+        public void Cheat(Boolean cheatMode = false)
+        {
+            CheatMode = cheatMode;
+            RefreshAllCells();
+        }
+
+        // Refresh all the cells on the gameField
+        public void RefreshAllCells()
+        {
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    smallCells[x, y].Refresh();
+                }
+            }
+        }
+
+        public void Reset(int gameFieldSize = 3)
+        {
+            // Clear the gameField
+            GameField.Children.Clear();
+
+            // Reset the inputCount
+            _inputCount = 0;
+
+            // Reset the game Finished Boolean
+            _gameFinished = false;
+
+            // Set the boardCount
+            GameFieldCount = gameFieldSize;
+
+            // Set the boardSize
+            GameFieldSize = GameFieldCount * GameFieldCount;
+
+            // Create all the gameField columns (depending on GameFieldSize)
+            GameField.Columns = GameField.Rows = GameFieldCount;
+
+            // Create all the big cells (2D array of gamefield size)
+            bigCells = new LargeCell[GameFieldCount, GameFieldCount];
+
+            // Create the gameField
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                // Create a new border
+                Border border = new Border();
+
+                // Set the border thickness
+                border.BorderThickness = new Thickness(1);
+
+                // Set the borderBrush color
+                border.BorderBrush = Brushes.Blue;
+
+                // Add the border to the gameField
+                GameField.Children.Add(border);
+
+                // Create a bigCell
+                LargeCell bigCell = new LargeCell();
+
+                // Add the bigCell as a child to the created border
+                border.Child = bigCell;
+
+                // Set the bigcells relative to the gameField size
+                bigCells[i % GameFieldCount, i / GameFieldCount] = bigCell;
+            }
+
+            // Load all the small cells
+            LoadAllSmallCells();
+
+            // Clear all the filled in values
+            _cheatDictionary.Clear();
+        }
+
+        // Load all the smallCells
+        private void LoadAllSmallCells()
+        {
+            // Check if the selected gameMode is for 3 x 3  (if not we need to disable the sudoku DLL)
+            if (GameFieldCount != 3)
+            {
+                _sudokuDLL = false;
+                MessageBox.Show("This gamemode cannot be played with the sudoku DLL. SudokuDLL unloaded");
+            }
+            // If the sudoDLL is used we need to create a game
+            if (SudokuDLL)
+            {
+                try
+                {
+                    _sudokuGame = new Sudoku.Game();
+                    _sudokuGame.create();
+                    Console.WriteLine("Sudoku DLL loaded successfully");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine("Error while loading sudoku DLL: \n\n" + ex.Message + "\n\n");
+                    SudokuDLL = false;
+                }
+            }
+
+            // Create the new smallCells
+            smallCells = new LittleCell[GameFieldSize, GameFieldSize];
+
+            // Reset the current X and Y position (Selected cell)
+            currentX = 0;
+            currentY = 0;
+
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    smallCells[x, y] = bigCells[x / GameFieldCount, y / GameFieldCount][x % GameFieldCount, y % GameFieldCount];
+                    smallCells[x, y].X = x;
+                    smallCells[x, y].Y = y;
+                }
+            }
+
+            // If the sudoku DLL is loaded we need to fill in the gameField
+            if (SudokuDLL)
+            {
+                FillSudokuFields();
+            }
+
+
+            /*  // Check array contents
+              Console.WriteLine("Soduku DLL contents: \n\n -------------------------------\n\n");
+              for (int x = 1; x <= GameFieldSize; x++)
+              {
+                  for (int y = 1; y <= GameFieldSize; y++)
+                  {
+                      int sudokuValue;
+                      _sudokuGame.get(x, y, out sudokuValue);
+                      Console.Write(sudokuValue);
+                      if (sudokuValue == -1)
+                      {
+                          Console.WriteLine();
+                      }
+                  }
+              } */
+
+
+            smallCells[0, 0].Selected = true;
+        }
+
+        // This method will fill in all the sudokuFields
+        private void FillSudokuFields()
+        {
+            for (int x = 0; x < GameFieldSize; x++)
+            {
+                for (int y = 0; y < GameFieldSize; y++)
+                {
+                    try
+                    {
+                        int sudokuValue;
+                        _sudokuGame.get(x + 1, y + 1, out sudokuValue);
+
+                        // Check if the sudoku value is not an empty (0) value
+                        if (sudokuValue > 0)
+                        {
+                            // Set the specified value                        
+                            SetNumber(x, y, sudokuValue, false, true);
+                            _cheatDictionary[new IntegerPoint(x, y)] = sudokuValue;
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine("Error while generating the sudoku field when using the Sudoku DLL: \n\n" + ex.Message + "\n\n");
+                        break;
+                    }
+                }
+            }
+        }
+
+        // This method will solve the sudoku puzzle (partially)
+        public void solvePuzzle(int cellsOver = 0)
+        {
+            for (int i = _inputCount; i < smallCells.Length - cellsOver; i++)
+            {
+                ShowHint();
+                System.Console.WriteLine(i);
+            }
+        }
+
+        // This method will get the current clicked cell
+        public void MouseClicked(object sender, MouseEventArgs click)
+        {
+            /* if (sender != null)
+             {
+                 UniformGrid _grid = sender as UniformGrid;
+                 int _row = (int)_grid.GetValue(Grid.RowProperty);
+                 int _column = (int)_grid.GetValue(Grid.ColumnProperty);
+                 MessageBox.Show(string.Format("Grid clicked at column {0}, row {1}", _column, _row));
+             } */
+        }
+
+        // This method will check what to do if a key is pressed
+        public void KeyPressed(KeyEventArgs e)
+        {
+            // Check if the keys left, right, up or down are pressed
+            if (e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up || e.Key == Key.Down)
+            {
+                // Disable the current selected cell
+                smallCells[currentX, currentY].Selected = false;
+
+                // Check which key is pressed and do the appropriate action
+                switch (e.Key)
+                {
+                    case Key.Left:
+                        currentX = (currentX + GameFieldSize - 1) % GameFieldSize;
+                        break;
+                    case Key.Right:
+                        currentX = (currentX + 1) % GameFieldSize;
+                        break;
+                    case Key.Up:
+                        currentY = (currentY + GameFieldSize - 1) % GameFieldSize;
+                        break;
+                    case Key.Down:
+                        currentY = (currentY + 1) % GameFieldSize;
+                        break;
+                }
+
+                // Set the current (new) cell to be selected
+                smallCells[currentX, currentY].Selected = true;
+            }
+
+            // Check if the numberkeys where pressed
+            if ((e.Key >= Key.D1 && e.Key <= Key.D9) || (e.Key >= Key.NumPad1 && e.Key <= Key.NumPad9))
+            {
+                int number = 0;
+                if (e.Key >= Key.D1 && e.Key <= Key.D9)
+                {
+                    number = e.Key - Key.D0;
+                }
+                else
+                {
+                    number = e.Key - Key.NumPad0;
+                }
+
+                IntegerPoint cellPoint = new IntegerPoint(currentX, currentY);
+
+                // Check if the cheatmode contains the key to be pressed
+                if (_cheatDictionary.ContainsKey(cellPoint))
+                {
+                    // Remove the userinput at the specified location
+                    _cheatDictionary.Remove(cellPoint);
+                }
+
+                // Check if the cheatMode does not contains the pressed numberKey and if the current has a candidate that can be selected
+                if (!_cheatDictionary.ContainsKey(cellPoint) && smallCells[currentX, currentY].CanSet(number))
+                {
+                    if (SetNumber(currentX, currentY, number))
+                    {
+                        _cheatDictionary[cellPoint] = number;
+                    }
+                }
+            }
+
+            if (e.Key == Key.Delete && !smallCells[currentX, currentY].ReadOnly)
+            {
+                // Add the option at the specified column
+                foreach (IntegerPoint cellPoint in GetPointsInColumn(currentX))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                // Add the option at the specified row
+                foreach (IntegerPoint cellPoint in GetPointsInRow(currentY))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                // Add the option at the specified BigCell
+                foreach (IntegerPoint cellPoint in GetPointsInParentBigCell(currentX, currentY))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].AddOption(smallCells[currentX, currentY].Determined);
+                }
+
+                smallCells[currentX, currentY].RemoveNumber(smallCells[currentX, currentY].Determined);
+            }
+        }
+
+        // Set the specified number
+        private Boolean SetNumber(int x, int y, int number, Boolean hint = false, Boolean readOnly = false)
+        {
+            if (!_gameFinished)
+            {
+                if (number < 1 || number > GameFieldSize || smallCells[x, y].ReadOnly)
+                {
+                    Console.WriteLine("Cannot set the value: The value is less or greater than the GameField size. (Or the cell is readOnly)\nActual Value: " + number + "\n");
+                    return false;
+                }
+
+                // Remove the option at the specified column
+                foreach (IntegerPoint cellPoint in GetPointsInColumn(x))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Remove the option at the specified row
+                foreach (IntegerPoint cellPoint in GetPointsInRow(y))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Remove the option at the specified BigCell
+                foreach (IntegerPoint cellPoint in GetPointsInParentBigCell(x, y))
+                {
+                    smallCells[cellPoint.X, cellPoint.Y].RemoveOption(number);
+                }
+
+                // Set the userInput on the specified cell
+                smallCells[x, y].MakeDecision(number, hint, readOnly);
+
+                _inputCount++;
+
+                if (_sudokuDLL)
+                {
+                    int canAdapt;
+                    _sudokuGame.set(x + 1, y + 1, number, out canAdapt);
+                }
+
+                if (CheatMode)
+                {
+                    // Check which numbers are still posible to set
+                    FindCheatNumbers(GetPointsInColumn(x));
+                    FindCheatNumbers(GetPointsInRow(y));
+                    FindCheatNumbers(GetPointsInParentBigCell(x, y));
+                }
+
+                // Check if we got a winner
+                if (_inputCount == smallCells.Length)
+                {
+                    if (CheckWinner())
+                    {
+                        _gameFinished = true;
+                        MessageBox.Show("Game finished!");
+                        return false;
+                    }
+                }
+                return true;
+            }
+            return false;
+        }
+
+        // Show a hint
+        public void ShowHint()
+        {
+            if (_sudokuDLL)
+            {
+                int hintPossible, value, x, y;
+                _sudokuGame.hint(out hintPossible, out x, out  y, out value);
+                
+                if (hintPossible == 1)
+                {
+                    // Todo: We need to decrease the inputCount if the hint overrides a value that was already set
+                    SetNumber(--x, --y , value, true);
+                }
+            }
+        }
+
+        // Save the game
+        public void Save()
+        {
+            if (_sudokuDLL)
+            {
+                int write;
+                _sudokuGame.write(out write);
+
+                if (write == 1)
+                {
+                    MessageBox.Show("File has been saved succesfully");
+                    RefreshAllCells();
+                }
+            }
+        }
+
+        // Load the game
+        public void Load()
+        {
+            if (_sudokuDLL)
+            {
+                int read;
+                _sudokuGame.read(out read);
+
+                if (read == 1)
+                {
+                    MessageBox.Show("File has been loaded succesfully");
+                    RefreshAllCells();
+                }
+            }
+        }
+
+        public Boolean CheckWinner()
+        {
+            int endGame;
+            _sudokuGame.isValid(out endGame);
+            return endGame == 1;
+        }
+
+        // Find the numbers that can be set (Cheat mode)
+        private void FindCheatNumbers(List<IntegerPoint> optionPoints)
+        {
+            try
+            {
+                Dictionary<int, int> dictionaryCount = new Dictionary<int, int>();
+                for (int i = 1; i <= GameFieldSize; i++)
+                {
+                    dictionaryCount[i] = 0;
+                }
+
+                foreach (IntegerPoint optionPoint in optionPoints)
+                {
+                    foreach (int option in smallCells[optionPoint.X, optionPoint.Y].Options)
+                    {
+                        dictionaryCount[option]++;
+                    }
+                }
+
+                foreach (int cell in (from keys in dictionaryCount.Keys where dictionaryCount[keys] == 1 select keys).ToArray())
+                {
+                    foreach (IntegerPoint cellPoint in optionPoints)
+                    {
+                        if (smallCells[cellPoint.X, cellPoint.Y].CanSet(cell))
+                            smallCells[cellPoint.X, cellPoint.Y].SetPossible(cell);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+        }
+
+        // Get the current points that where set in the bigCell
+        private static List<IntegerPoint> GetPointsInParentBigCell(int x, int y)
+        {
+            int x0 = x - x % GameFieldCount;
+            int y0 = y - y % GameFieldCount;
+
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(x0 + i % GameFieldCount, y0 + i / GameFieldCount));
+            }
+            return cellPoints;
+        }
+
+        // Get the current points that where set in the current row
+        private static List<IntegerPoint> GetPointsInRow(int y)
+        {
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(i, y));
+            }
+            return cellPoints;
+        }
+
+        // Create a property to check if the sudokuDLL is used
+        public Boolean SudokuDLL
+        {
+            get { return _sudokuDLL; }
+            set
+            {
+                _sudokuDLL = value;
+                Reset(GameFieldCount);
+            }
+        }
+
+
+        // Get the current points that where set in the current column
+        private static List<IntegerPoint> GetPointsInColumn(int x)
+        {
+            List<IntegerPoint> cellPoints = new List<IntegerPoint>();
+            for (int i = 0; i < GameFieldSize; i++)
+            {
+                cellPoints.Add(new IntegerPoint(x, i));
+            }
+            return cellPoints;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Models/Constants.cs b/Sudoku_-_DLL/Models/Constants.cs
new file mode 100644
index 0000000..f6172ee
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Constants.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models
+{
+    public static class Constants
+    {
+        public static Color DefaultSmallCellFontColor = Colors.Green;
+        public static Color DefaultSmallCellReadOnlyFontColor = Colors.Red;
+        public static Color DefaultSmallCellHintFontColor = Colors.Orange;
+
+        public static Color CheatActivedFontColor = Colors.Blue;        
+
+    }
+}
diff --git a/Sudoku_-_DLL/Models/Converters/BackgroundValueConverter.cs b/Sudoku_-_DLL/Models/Converters/BackgroundValueConverter.cs
new file mode 100644
index 0000000..c00bd47
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Converters/BackgroundValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class BackgroundValueConverter : IValueConverter
+    {
+        private static readonly BackgroundValueConverter _instance = new BackgroundValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Boolean && targetType == typeof(Brush))
+            {
+                Boolean color = (Boolean)value;
+                if (color)
+                    return Brushes.Red;
+                else
+                    return Brushes.Transparent;
+            }
+
+            // The type is not a brush
+            return null;
+        }
+
+        // Create a property to get the instance of the BackgroundValue
+        public static BackgroundValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Models/Converters/BorderValueConverter.cs b/Sudoku_-_DLL/Models/Converters/BorderValueConverter.cs
new file mode 100644
index 0000000..b03a8e4
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Converters/BorderValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class BorderValueConverter : IValueConverter
+    {
+        private static readonly BorderValueConverter _instance = new BorderValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is Boolean && targetType == typeof(Brush))
+            {
+                Boolean color = (Boolean)value;
+                if (color)
+                    return Brushes.Orange;
+                else
+                    return Brushes.Transparent;
+            }
+
+            // The type is not a brush
+            return null;
+        }
+
+        // Create a property to get the instance of the BorderValue
+        public static BorderValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Models/Converters/Number2BrushValueConverter.cs b/Sudoku_-_DLL/Models/Converters/Number2BrushValueConverter.cs
new file mode 100644
index 0000000..6b99cba
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Converters/Number2BrushValueConverter.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class Number2BrushValueConverter : IValueConverter
+    {
+        private static readonly Number2BrushValueConverter _instance = new Number2BrushValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is int) || targetType != typeof(Brush))
+                throw new InvalidCastException();
+
+            int number = (int)value;
+            return NumberBrushes.GetBrush(number, (Color)parameter);
+        }
+
+        // Create a property to get the instance of the Number2BrushValue
+        public static Number2BrushValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Models/Converters/OptionsValueConverter.cs b/Sudoku_-_DLL/Models/Converters/OptionsValueConverter.cs
new file mode 100644
index 0000000..cfcc3df
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Converters/OptionsValueConverter.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class OptionsValueConverter : IValueConverter
+    {
+        private static readonly OptionsValueConverter _instance = new OptionsValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is HashSet<int>) || targetType != typeof(Brush) || !(parameter is int))
+                throw new InvalidCastException();
+
+            HashSet<int> set = (HashSet<int>)value;
+            int number = (int)parameter;
+
+            if (set.Contains(number) && BoardModel.CheatMode)
+                return NumberBrushes.GetBrush(number, Constants.CheatActivedFontColor);
+            else
+                return Brushes.Transparent;
+        }
+
+        // Create a property to get the instance of the OptionsValue
+        public static OptionsValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Models/Converters/VisibilityValueConverter.cs b/Sudoku_-_DLL/Models/Converters/VisibilityValueConverter.cs
new file mode 100644
index 0000000..ba9d832
--- /dev/null
+++ b/Sudoku_-_DLL/Models/Converters/VisibilityValueConverter.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows;
+
+namespace SudokuWeek4.Models.Converters
+{
+    internal class VisibilityValueConverter : IValueConverter
+    {
+        private static readonly VisibilityValueConverter _instance = new VisibilityValueConverter();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is bool) || targetType != typeof(Visibility))
+                throw new InvalidCastException();
+
+            bool visible = (bool)value;
+            if (parameter != null)
+                visible =! visible;
+
+            if (visible)
+                return Visibility.Visible;
+            else
+                return Visibility.Hidden;
+        }
+
+        // Create a property to get the instance of the OptionsValue
+        public static VisibilityValueConverter Instance
+        {
+            get { return _instance; }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Models/IntegerPoint.cs b/Sudoku_-_DLL/Models/IntegerPoint.cs
new file mode 100644
index 0000000..19f1086
--- /dev/null
+++ b/Sudoku_-_DLL/Models/IntegerPoint.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SudokuWeek4.Models
+{
+	internal struct IntegerPoint
+	{
+		public int X;
+		public int Y;
+
+		public IntegerPoint(int x, int y)
+		{
+			X = x;
+			Y = y;
+		}
+
+        // Check if the given objectPoint is an IntegerPoint
+		public override bool Equals(object objectPoint)
+		{
+			if( objectPoint == null || objectPoint.GetType() != typeof(IntegerPoint) )
+				return false;
+
+			return Equals((IntegerPoint)objectPoint);
+		}
+
+        // Check if the X and Y are equal to eachother
+        public bool Equals(IntegerPoint objectPoint)
+		{
+            return objectPoint.X == X && objectPoint.Y == Y;
+		}
+
+        // We do not need this (just to have all the overrides)
+		public override int GetHashCode()
+		{
+            return 0;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Models/LargeCell.xaml b/Sudoku_-_DLL/Models/LargeCell.xaml
new file mode 100644
index 0000000..170c11e
--- /dev/null
+++ b/Sudoku_-_DLL/Models/LargeCell.xaml
@@ -0,0 +1,6 @@
+<UserControl x:Class="SudokuWeek4.Models.LargeCell"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Padding="1,1,0,0">
+    <UniformGrid Name="bigCellGrid" />
+</UserControl>
diff --git a/Sudoku_-_DLL/Models/LargeCell.xaml.cs b/Sudoku_-_DLL/Models/LargeCell.xaml.cs
new file mode 100644
index 0000000..7948e3a
--- /dev/null
+++ b/Sudoku_-_DLL/Models/LargeCell.xaml.cs
@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.Models
+{
+	public partial class LargeCell : UserControl
+	{
+        // This array will hold the smallCells
+        private LittleCell[,] _littleCells;
+
+        // Create the contructor
+        public LargeCell()
+		{
+            try
+            {
+                InitializeComponent();
+                Initialize();
+            }
+            catch (Exception) {
+                System.Console.WriteLine("Cannot create the largeCell  Sudoku Error.");
+            }
+		}
+
+        // Intialize the game
+		private void Initialize()
+		{
+            // Clear all the contents of the bigCellGrid
+			bigCellGrid.Children.Clear();
+
+            // Set the rows and columns to the size of the gameField
+            bigCellGrid.Columns = bigCellGrid.Rows = BoardModel.GameFieldCount;
+
+            // Create a new array with all the smallCells to the size of the gameField
+            _littleCells = new LittleCell[BoardModel.GameFieldCount, BoardModel.GameFieldCount];
+
+            // Create all the smallCells that will come inside the bigCells
+            for (int i = 0; i < BoardModel.GameFieldSize; i++)
+			{
+				Border border = new Border();
+				border.BorderThickness = new Thickness (1);
+				border.BorderBrush = Brushes.Green;
+				border.Margin = new Thickness (-1, -1, 0, 0);
+				bigCellGrid.Children.Add (border);
+
+				LittleCell smallCell = new LittleCell ();
+				border.Child = smallCell;
+
+                _littleCells[i % BoardModel.GameFieldCount, i / BoardModel.GameFieldCount] = smallCell;
+			}
+		}
+
+        // This property returns the specified SmallCell
+		public LittleCell this[int x, int y]
+		{
+			get { return _littleCells[x, y]; }
+		}
+	}
+}
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Models/LittleCell.xaml b/Sudoku_-_DLL/Models/LittleCell.xaml
new file mode 100644
index 0000000..d0ec1a1
--- /dev/null
+++ b/Sudoku_-_DLL/Models/LittleCell.xaml
@@ -0,0 +1,11 @@
+<UserControl x:Class="SudokuWeek4.Models.LittleCell"
+			 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+			 xmlns:Sudoku="clr-namespace:SudokuWeek4">
+	<Border Name="smallBorder" BorderThickness="4">
+		<Grid>
+			<Grid Name="inputGrid" />
+			<UniformGrid Name="optionsGrid" />
+		</Grid>
+	</Border>
+</UserControl>
diff --git a/Sudoku_-_DLL/Models/LittleCell.xaml.cs b/Sudoku_-_DLL/Models/LittleCell.xaml.cs
new file mode 100644
index 0000000..cc60486
--- /dev/null
+++ b/Sudoku_-_DLL/Models/LittleCell.xaml.cs
@@ -0,0 +1,259 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Media;
+using SudokuWeek4.Models.Converters;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.Models
+{
+    public partial class LittleCell : UserControl, INotifyPropertyChanged
+    {
+        // Define a hashSet of the available options
+        private readonly HashSet<int> _options = new HashSet<int>();
+
+        // Define a hashSet of the possible solutions
+        private readonly HashSet<int> _solutions = new HashSet<int>();
+
+        // Define if the cell is selected
+        private Boolean _selected;
+
+        // This will hold the X and Y position of the cell
+        public int X, Y;
+
+        // Set the cell to be readOnly
+        private Boolean _readOnly;
+
+        // Set the cell fontColor
+        private Color _fontColor;
+
+        // Create a nullable int to check if the cell is already filled-in
+        private int? _inputPlaced;
+
+        // Create the OnPropertyChanged Event
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private void OnPropertyChanged(string name)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(name));
+        }
+
+        // Create the constructor
+        public LittleCell()
+        {
+            InitializeComponent();
+
+            // Set the color to the default color
+            FontColor = Colors.Green;
+
+            // Bind the currently selected cell
+            Binding bind = new Binding("Selected");
+            bind.Source = this;
+            bind.Converter = BorderValueConverter.Instance;
+            smallBorder.SetBinding(Border.BorderBrushProperty, bind);
+
+            // Bind the cell if there is a solution (possible)
+            bind = new Binding("Solution");
+            bind.Source = this;
+            bind.Converter = BackgroundValueConverter.Instance;
+            this.SetBinding(BackgroundProperty, bind);
+
+            // Set the columns and the rows of the Options to the size of the gameField
+            optionsGrid.Columns = optionsGrid.Rows = BoardModel.GameFieldCount;
+            for (int i = 1; i <= BoardModel.GameFieldSize; i++)
+            {
+                Grid child = new Grid();
+                child.Margin = new Thickness(2);
+                optionsGrid.Children.Add(child);
+
+                // Bind the available options to the cells (Cheat Mode)
+                bind = new Binding("Options");
+                bind.Source = this;
+                bind.Converter = OptionsValueConverter.Instance;
+                bind.ConverterParameter = i;
+                child.SetBinding(BackgroundProperty, bind);
+            }
+
+            // Bind if the grid was placed
+            bind = new Binding("Determined");
+            bind.Source = this;
+            bind.ConverterParameter = Constants.DefaultSmallCellFontColor;
+            bind.Converter = Number2BrushValueConverter.Instance;
+            inputGrid.SetBinding(BackgroundProperty, bind);
+
+            // Bind if the inputGrid needs to be visible
+            bind = new Binding("IsDetermined");
+            bind.Source = this;
+            bind.Converter = VisibilityValueConverter.Instance;
+            inputGrid.SetBinding(VisibilityProperty, bind);
+
+            // Bind if the optionsGrid is determined
+            bind = new Binding("IsDetermined");
+            bind.Source = this;
+            bind.Converter = VisibilityValueConverter.Instance;
+            bind.ConverterParameter = 0;
+            optionsGrid.SetBinding(VisibilityProperty, bind);
+
+            Clear();
+        }
+
+        // This property will change the FontColor
+        public Color FontColor
+        {
+            get { return _fontColor; }
+            set { _fontColor = value; }
+        }
+
+        // This function will clear the cell
+        public void Clear()
+        {
+            // Clear all the available options
+            _options.Clear();
+
+            // Add all the available options to the optionsGrid
+            for (int i = 1; i <= BoardModel.GameFieldSize; i++)
+                _options.Add(i);
+
+            _inputPlaced = null;
+            _solutions.Clear();
+            Refresh();
+        }
+
+        // Refresh all the bindings
+        public void Refresh() 
+        {
+            OnPropertyChanged(null);
+        }
+
+        // Create a property to get available Options (CheatMode)
+        public HashSet<int> Options
+        {
+            get { return _options; }
+        }
+
+        // Check if the cell can be set with a number
+        public Boolean CanSet(int number)
+        {
+            if (BoardModel.CheatMode)
+                return _options.Contains(number);
+            else
+                return true;
+        }
+
+        // Remove the number from the specified cell
+        public void RemoveNumber(int number)
+        {
+            _inputPlaced = null;
+            Refresh();
+        }
+
+        // Add the option from the specified cell
+        public void AddOption(int number)
+        {
+            _options.Add(number);
+            Refresh();
+        }
+
+        // Remove the option from the specified cell
+        public void RemoveOption(int number)
+        {
+            _options.Remove(number);
+            Refresh();
+        }
+
+        // Create a property to check if the cell has a number
+        public bool IsDetermined
+        {
+            get { return _inputPlaced.HasValue; }
+        }
+
+        // Create a property to get the current cellNumber
+        public int Determined
+        {
+            get { return _inputPlaced.GetValueOrDefault(); }
+        }
+
+        // This method will make a decision on a specified cell
+        public void MakeDecision(int number, Boolean hint = false, Boolean readOnly = false)
+        {
+            if (!_readOnly)
+            {
+                _inputPlaced = number;
+                _readOnly = readOnly;
+
+                if (readOnly || hint)
+                {
+                    if (readOnly)
+                    {
+                        // Set the color of the font to the readOnly Font
+                        FontColor = Constants.DefaultSmallCellReadOnlyFontColor;
+                    }
+                    else if (hint) 
+                    {
+                        // Set the color of the font to the hint Font
+                        FontColor = Constants.DefaultSmallCellHintFontColor;
+                    }
+
+                    // Rebind the cell (with the new color)
+                    Binding bind = new Binding("Determined");
+                    bind.Source = this;
+                    bind.Converter = Number2BrushValueConverter.Instance;
+                    bind.ConverterParameter = FontColor;
+                    inputGrid.SetBinding(BackgroundProperty, bind);
+                }
+                Refresh();
+            }
+        }
+
+        // Create a property to check if the cell is readOnly
+        public Boolean ReadOnly
+        {
+            get { return _readOnly; }
+        }
+
+        // Create a property to check if there is a solution
+        public Boolean Solution
+        {
+            get
+            {
+                if (!BoardModel.CheatMode)
+                    return false;
+
+                if (_inputPlaced.HasValue)
+                    return false;
+
+                if (_solutions.Count > 1)
+                    return true;
+
+                return _options.Count == 0;
+            }
+        }
+
+        // Set the specified cell to a possible solution
+        public void SetPossible(int cell)
+        {
+            _solutions.Add(cell);
+            Refresh();
+        }
+
+        // Create a property to check which cell is selected
+        public Boolean Selected
+        {
+            get { return _selected; }
+            set
+            {
+                if (value != _selected)
+                {
+                    _selected = value;
+                    OnPropertyChanged("Selected");
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Models/NumberBrushes.cs b/Sudoku_-_DLL/Models/NumberBrushes.cs
new file mode 100644
index 0000000..14b02a5
--- /dev/null
+++ b/Sudoku_-_DLL/Models/NumberBrushes.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Windows;
+using System.Windows.Media;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4
+{
+	internal static class NumberBrushes
+	{
+        // Create a dictionary for the cached brushes (per cell)
+		private static readonly Dictionary<string, DrawingBrush> cachedBrushes = new Dictionary<string, DrawingBrush>();
+
+		public static DrawingBrush GetBrush(int number, Color colorBrush)
+		{
+            // Check if the index is out of bounds
+            if (number < 0 || number > BoardModel.GameFieldSize)
+				throw new IndexOutOfRangeException();
+
+			// Get the cached brush (if exists)
+            string key = number + colorBrush.ToString();
+			DrawingBrush brush;
+
+			if (cachedBrushes.TryGetValue(key, out brush))
+				return brush;
+
+			// Create a new brush (not in cache)
+			FormattedText formtxt = new FormattedText(number.ToString(), CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("Times New Roman"), 100, Brushes.Black);
+			Geometry textGeometry = formtxt.BuildGeometry(new Point(0, 0));
+            brush = new DrawingBrush(new GeometryDrawing(new SolidColorBrush(colorBrush), null, textGeometry));
+			brush.Stretch = Stretch.Uniform;
+
+			cachedBrushes[key] = brush;
+			return brush;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Properties/AssemblyInfo.cs b/Sudoku_-_DLL/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..aca0baf
--- /dev/null
+++ b/Sudoku_-_DLL/Properties/AssemblyInfo.cs
@@ -0,0 +1,55 @@
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle( "Sudoku" )]
+[assembly: AssemblyDescription( "" )]
+[assembly: AssemblyConfiguration( "" )]
+[assembly: AssemblyCompany("SuperSmash")]
+[assembly: AssemblyProduct( "Sudoku" )]
+[assembly: AssemblyCopyright("Copyright © SuperSmash 2012")]
+[assembly: AssemblyTrademark( "" )]
+[assembly: AssemblyCulture( "" )]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible( false )]
+
+//In order to begin building localizable applications, set 
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+	ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+	//(used if a resource is not found in the page, 
+	// or application resource dictionaries)
+	ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+	//(used if a resource is not found in the page, 
+	// app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]
diff --git a/Sudoku_-_DLL/Properties/Resources.Designer.cs b/Sudoku_-_DLL/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..d56fec4
--- /dev/null
+++ b/Sudoku_-_DLL/Properties/Resources.Designer.cs
@@ -0,0 +1,63 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("SudokuWeek4.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Properties/Resources.resx b/Sudoku_-_DLL/Properties/Resources.resx
new file mode 100644
index 0000000..04e2214
--- /dev/null
+++ b/Sudoku_-_DLL/Properties/Resources.resx
@@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+</root>
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Properties/Settings.Designer.cs b/Sudoku_-_DLL/Properties/Settings.Designer.cs
new file mode 100644
index 0000000..9ff9493
--- /dev/null
+++ b/Sudoku_-_DLL/Properties/Settings.Designer.cs
@@ -0,0 +1,26 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    
+    
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "10.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+        
+        public static Settings Default {
+            get {
+                return defaultInstance;
+            }
+        }
+    }
+}
diff --git a/Sudoku_-_DLL/Properties/Settings.settings b/Sudoku_-_DLL/Properties/Settings.settings
new file mode 100644
index 0000000..033d7a5
--- /dev/null
+++ b/Sudoku_-_DLL/Properties/Settings.settings
@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Sudoku.csproj b/Sudoku_-_DLL/Sudoku.csproj
new file mode 100644
index 0000000..3f06601
--- /dev/null
+++ b/Sudoku_-_DLL/Sudoku.csproj
@@ -0,0 +1,217 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>9.0.21022</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{C835CFCA-0A38-40C5-BEA8-3822441B27EC}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>SudokuWeek4</RootNamespace>
+    <AssemblyName>SudokuDLL</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <ApplicationIcon>
+    </ApplicationIcon>
+    <FileUpgradeFlags>
+    </FileUpgradeFlags>
+    <UpgradeBackupLocation>
+    </UpgradeBackupLocation>
+    <OldToolsVersion>3.5</OldToolsVersion>
+    <PublishUrl>publish\</PublishUrl>
+    <Install>true</Install>
+    <InstallFrom>Disk</InstallFrom>
+    <UpdateEnabled>false</UpdateEnabled>
+    <UpdateMode>Foreground</UpdateMode>
+    <UpdateInterval>7</UpdateInterval>
+    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
+    <UpdatePeriodically>false</UpdatePeriodically>
+    <UpdateRequired>false</UpdateRequired>
+    <MapFileExtensions>true</MapFileExtensions>
+    <ApplicationRevision>0</ApplicationRevision>
+    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <IsWebBootstrapper>false</IsWebBootstrapper>
+    <UseApplicationTrust>false</UseApplicationTrust>
+    <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x86\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Debug\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>false</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <OutputPath>bin\x86\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Release\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>true</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+    <CodeAnalysisIgnoreBuiltInRules>true</CodeAnalysisIgnoreBuiltInRules>
+    <CodeAnalysisFailOnMissingRules>false</CodeAnalysisFailOnMissingRules>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject />
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data.DataSetExtensions">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="UIAutomationProvider">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationCore">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationFramework">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Include="Models\LargeCell.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Page Include="Models\LittleCell.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="Models\BoardModel.cs" />
+    <Compile Include="Models\Constants.cs" />
+    <Compile Include="Models\Converters\BackgroundValueConverter.cs" />
+    <Compile Include="Models\Converters\BorderValueConverter.cs" />
+    <Compile Include="Models\Converters\Number2BrushValueConverter.cs" />
+    <Compile Include="Models\Converters\OptionsValueConverter.cs" />
+    <Compile Include="Models\Converters\VisibilityValueConverter.cs" />
+    <Compile Include="ViewModels\MainViewModel.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Models\LargeCell.xaml.cs">
+      <DependentUpon>LargeCell.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Models\IntegerPoint.cs" />
+    <Compile Include="Models\NumberBrushes.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <Compile Include="Models\LittleCell.xaml.cs">
+      <DependentUpon>LittleCell.xaml</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <AppDesigner Include="Properties\" />
+  </ItemGroup>
+  <ItemGroup>
+    <BootstrapperPackage Include="Microsoft.Net.Client.3.5">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1 Client Profile</ProductName>
+      <Install>false</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Windows.Installer.3.1">
+      <Visible>False</Visible>
+      <ProductName>Windows Installer 3.1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\" />
+  </ItemGroup>
+  <ItemGroup>
+    <COMReference Include="Sudoku">
+      <Guid>{FC98639C-8987-42D6-B20C-8BE179AB7C55}</Guid>
+      <VersionMajor>1</VersionMajor>
+      <VersionMinor>0</VersionMinor>
+      <Lcid>0</Lcid>
+      <WrapperTool>tlbimp</WrapperTool>
+      <Isolated>False</Isolated>
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+    </COMReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/Sudoku_-_DLL/Sudoku.sln b/Sudoku_-_DLL/Sudoku.sln
new file mode 100644
index 0000000..be91157
--- /dev/null
+++ b/Sudoku_-_DLL/Sudoku.sln
@@ -0,0 +1,26 @@
+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sudoku", "Sudoku.csproj", "{C835CFCA-0A38-40C5-BEA8-3822441B27EC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.ActiveCfg = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.Build.0 = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.ActiveCfg = Release|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Sudoku_-_DLL/ViewModels/MainViewModel.cs b/Sudoku_-_DLL/ViewModels/MainViewModel.cs
new file mode 100644
index 0000000..c2c2205
--- /dev/null
+++ b/Sudoku_-_DLL/ViewModels/MainViewModel.cs
@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using SudokuWeek4.Models;
+
+namespace SudokuWeek4.ViewModels
+{
+    public class MainViewModel
+    {
+        private BoardModel _board;
+        private UniformGrid _gameField;
+
+        public MainViewModel(UniformGrid gameField)
+        {
+            _board = new BoardModel();
+            _gameField = gameField;
+            _gameField.Children.Add(GameField());
+        }
+
+        public void Reset(int boardSize) 
+        {
+            _board.Reset(boardSize);
+        }
+
+        public void Cheat(Boolean cheatMode) 
+        {
+            _board.Cheat(cheatMode);
+        }
+
+        public void ShowHint()
+        {
+            _board.ShowHint();
+        }
+
+        public void Save() 
+        {
+            _board.Save();
+        }
+
+        public void Load()
+        {
+            _board.Load();
+        }
+
+        public UniformGrid GameField()
+        {
+            return _board.GameField;
+        }
+
+        public void EnableDLL(Boolean state) 
+        {
+            _board.SudokuDLL = state;
+        }
+
+        public void SolvePuzzle(int cellsOver = 0) 
+        {
+            _board.solvePuzzle(cellsOver);
+        }
+
+        public void keyPressed(KeyEventArgs key) 
+        {
+            _board.KeyPressed(key);
+        }
+
+        public void mouseClicked(object sender, MouseEventArgs click) 
+        {
+            _board.MouseClicked(sender, click);
+        }
+    }
+}
diff --git a/Sudoku_-_View/App.xaml b/Sudoku_-_View/App.xaml
new file mode 100644
index 0000000..1093c01
--- /dev/null
+++ b/Sudoku_-_View/App.xaml
@@ -0,0 +1,8 @@
+<Application x:Class="SudokuWeek4.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="Views\MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>
diff --git a/Sudoku_-_View/App.xaml.cs b/Sudoku_-_View/App.xaml.cs
new file mode 100644
index 0000000..77619ef
--- /dev/null
+++ b/Sudoku_-_View/App.xaml.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Windows;
+
+namespace SudokuWeek4
+{
+	public partial class App : Application
+	{
+	}
+}
diff --git a/Sudoku_-_View/Libraries/SudokuDLL.dll b/Sudoku_-_View/Libraries/SudokuDLL.dll
new file mode 100644
index 0000000..24bafe5
Binary files /dev/null and b/Sudoku_-_View/Libraries/SudokuDLL.dll differ
diff --git a/Sudoku_-_View/Libraries/register.bat b/Sudoku_-_View/Libraries/register.bat
new file mode 100644
index 0000000..f54409a
--- /dev/null
+++ b/Sudoku_-_View/Libraries/register.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Sudoku_-_View/Libraries/unregister.bat b/Sudoku_-_View/Libraries/unregister.bat
new file mode 100644
index 0000000..74dc2c7
--- /dev/null
+++ b/Sudoku_-_View/Libraries/unregister.bat
@@ -0,0 +1,2 @@
+
+C:\Windows\System32\regsvr32 /u  E:\Programmering\C#\Sudoku\Complete\Libraries\Sudoku.dll
diff --git a/Sudoku_-_View/Properties/AssemblyInfo.cs b/Sudoku_-_View/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..aca0baf
--- /dev/null
+++ b/Sudoku_-_View/Properties/AssemblyInfo.cs
@@ -0,0 +1,55 @@
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle( "Sudoku" )]
+[assembly: AssemblyDescription( "" )]
+[assembly: AssemblyConfiguration( "" )]
+[assembly: AssemblyCompany("SuperSmash")]
+[assembly: AssemblyProduct( "Sudoku" )]
+[assembly: AssemblyCopyright("Copyright © SuperSmash 2012")]
+[assembly: AssemblyTrademark( "" )]
+[assembly: AssemblyCulture( "" )]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible( false )]
+
+//In order to begin building localizable applications, set 
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+	ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+	//(used if a resource is not found in the page, 
+	// or application resource dictionaries)
+	ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+	//(used if a resource is not found in the page, 
+	// app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion( "1.0.0.0" )]
+[assembly: AssemblyFileVersion( "1.0.0.0" )]
diff --git a/Sudoku_-_View/Properties/Resources.Designer.cs b/Sudoku_-_View/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..d56fec4
--- /dev/null
+++ b/Sudoku_-_View/Properties/Resources.Designer.cs
@@ -0,0 +1,63 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("SudokuWeek4.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+    }
+}
diff --git a/Sudoku_-_View/Properties/Resources.resx b/Sudoku_-_View/Properties/Resources.resx
new file mode 100644
index 0000000..04e2214
--- /dev/null
+++ b/Sudoku_-_View/Properties/Resources.resx
@@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+</root>
\ No newline at end of file
diff --git a/Sudoku_-_View/Properties/Settings.Designer.cs b/Sudoku_-_View/Properties/Settings.Designer.cs
new file mode 100644
index 0000000..9ff9493
--- /dev/null
+++ b/Sudoku_-_View/Properties/Settings.Designer.cs
@@ -0,0 +1,26 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.544
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace SudokuWeek4.Properties {
+    
+    
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "10.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+        
+        public static Settings Default {
+            get {
+                return defaultInstance;
+            }
+        }
+    }
+}
diff --git a/Sudoku_-_View/Properties/Settings.settings b/Sudoku_-_View/Properties/Settings.settings
new file mode 100644
index 0000000..033d7a5
--- /dev/null
+++ b/Sudoku_-_View/Properties/Settings.settings
@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>
\ No newline at end of file
diff --git a/Sudoku_-_View/Sudoku.csproj b/Sudoku_-_View/Sudoku.csproj
new file mode 100644
index 0000000..f41e44a
--- /dev/null
+++ b/Sudoku_-_View/Sudoku.csproj
@@ -0,0 +1,202 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>9.0.21022</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{C835CFCA-0A38-40C5-BEA8-3822441B27EC}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>SudokuWeek4</RootNamespace>
+    <AssemblyName>Sudoku</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <ApplicationIcon>
+    </ApplicationIcon>
+    <FileUpgradeFlags>
+    </FileUpgradeFlags>
+    <UpgradeBackupLocation>
+    </UpgradeBackupLocation>
+    <OldToolsVersion>3.5</OldToolsVersion>
+    <PublishUrl>publish\</PublishUrl>
+    <Install>true</Install>
+    <InstallFrom>Disk</InstallFrom>
+    <UpdateEnabled>false</UpdateEnabled>
+    <UpdateMode>Foreground</UpdateMode>
+    <UpdateInterval>7</UpdateInterval>
+    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
+    <UpdatePeriodically>false</UpdatePeriodically>
+    <UpdateRequired>false</UpdateRequired>
+    <MapFileExtensions>true</MapFileExtensions>
+    <ApplicationRevision>0</ApplicationRevision>
+    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <IsWebBootstrapper>false</IsWebBootstrapper>
+    <UseApplicationTrust>false</UseApplicationTrust>
+    <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x86\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Debug\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>false</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <OutputPath>bin\x86\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <CodeAnalysisLogFile>bin\Release\Sudoku.exe.CodeAnalysisLog.xml</CodeAnalysisLogFile>
+    <CodeAnalysisUseTypeNameInSuppression>true</CodeAnalysisUseTypeNameInSuppression>
+    <CodeAnalysisModuleSuppressionsFile>GlobalSuppressions.cs</CodeAnalysisModuleSuppressionsFile>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSetDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories>
+    <CodeAnalysisIgnoreBuiltInRuleSets>true</CodeAnalysisIgnoreBuiltInRuleSets>
+    <CodeAnalysisRuleDirectories>;C:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories>
+    <CodeAnalysisIgnoreBuiltInRules>true</CodeAnalysisIgnoreBuiltInRules>
+    <CodeAnalysisFailOnMissingRules>false</CodeAnalysisFailOnMissingRules>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject />
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="SudokuDLL">
+      <HintPath>Libraries\SudokuDLL.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data.DataSetExtensions">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="UIAutomationProvider">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationCore">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="PresentationFramework">
+      <RequiredTargetFramework>3.0</RequiredTargetFramework>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Page Include="Views\MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Views\MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <None Include="app.config" />
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <AppDesigner Include="Properties\" />
+  </ItemGroup>
+  <ItemGroup>
+    <BootstrapperPackage Include="Microsoft.Net.Client.3.5">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1 Client Profile</ProductName>
+      <Install>false</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+    <BootstrapperPackage Include="Microsoft.Windows.Installer.3.1">
+      <Visible>False</Visible>
+      <ProductName>Windows Installer 3.1</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/Sudoku_-_View/Sudoku.sln b/Sudoku_-_View/Sudoku.sln
new file mode 100644
index 0000000..be91157
--- /dev/null
+++ b/Sudoku_-_View/Sudoku.sln
@@ -0,0 +1,26 @@
+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sudoku", "Sudoku.csproj", "{C835CFCA-0A38-40C5-BEA8-3822441B27EC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.ActiveCfg = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Debug|x86.Build.0 = Debug|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.ActiveCfg = Release|x86
+		{C835CFCA-0A38-40C5-BEA8-3822441B27EC}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Sudoku_-_View/Views/MainWindow.xaml b/Sudoku_-_View/Views/MainWindow.xaml
new file mode 100644
index 0000000..be575ab
--- /dev/null
+++ b/Sudoku_-_View/Views/MainWindow.xaml
@@ -0,0 +1,30 @@
+<Window x:Class="SudokuWeek4.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Sudoku="clr-namespace:SudokuWeek4"
+        Title="Week4 - Sudoku" PreviewKeyDown="mainGrid_PreviewKeyDown" PreviewMouseLeftButtonUp="Window_PreviewMouseLeftButtonUp">
+    <DockPanel>
+        <Menu DockPanel.Dock="Top" KeyboardNavigation.DirectionalNavigation="None">
+            <MenuItem Header="Game">
+                <MenuItem Header="Enable Sudoku DLL" Click="MenuItem_EnableDLL" />
+                <MenuItem Header="2x2" Tag="2" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="3x3" Tag="3" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="4x4" Tag="4" Click="MenuItem_ResetBoard" />
+                <MenuItem Header="Enable/Disable CheatMode" Click="MenuItem_CheatMode" />
+                <MenuItem Header="Save game" Click="MenuItem_Save" />
+                <MenuItem Header="Load game" Click="MenuItem_Load" />
+                <MenuItem Header="Quit game" Click="MenuItem_Quit" />
+            </MenuItem>
+            <Separator/>
+            <Separator/>
+            <MenuItem Header="Hint" Click="MenuItem_Hint" />
+            <Separator/>
+            <Separator/>
+            <MenuItem Header="Lazymode">
+                <MenuItem Header="Solve (Partially)" Click="MenuItem_SolvePartially" />
+                <MenuItem Header="Solve (Completely)" Click="MenuItem_Solve" />
+            </MenuItem>            
+        </Menu>
+        <Border BorderBrush="Black" BorderThickness="3" Margin="5">
+            <UniformGrid Name="mainGrid" />
+        </Border>
+    </DockPanel>
+</Window>
\ No newline at end of file
diff --git a/Sudoku_-_View/Views/MainWindow.xaml.cs b/Sudoku_-_View/Views/MainWindow.xaml.cs
new file mode 100644
index 0000000..183d603
--- /dev/null
+++ b/Sudoku_-_View/Views/MainWindow.xaml.cs
@@ -0,0 +1,95 @@
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System;
+using SudokuWeek4.ViewModels;
+using System.Windows.Input;
+
+namespace SudokuWeek4
+{
+	public partial class MainWindow : Window
+	{
+        private int _boardSize = 3;
+        private Boolean _cheatMode = false;
+        private Boolean _sudokuDLL = true;
+        private MainViewModel _mainViewModel;
+
+		public MainWindow()
+		{
+			InitializeComponent();
+            _mainViewModel = new MainViewModel(mainGrid);
+            Reset(_boardSize);
+        }
+
+        // Reset the gameField
+        private void Reset(int boardSize) {
+            _mainViewModel.Reset(boardSize);
+        }
+
+        // Save the game
+        private void MenuItem_Save(object sender, RoutedEventArgs e)
+		{           
+            _mainViewModel.Save();
+		}
+
+        // Load the game
+        private void MenuItem_Load(object sender, RoutedEventArgs e)
+		{
+            _mainViewModel.Load();
+		}
+
+        // Reset the gameField
+		private void MenuItem_ResetBoard(object sender, RoutedEventArgs e)
+		{           
+            Reset(int.Parse(((MenuItem)sender).Tag.ToString()));
+		}
+
+        // Get a hint
+        private void MenuItem_Hint(object sender, RoutedEventArgs e)
+		{           
+            _mainViewModel.ShowHint();
+		}
+
+        // Enable the sudoku DLL
+        private void MenuItem_EnableDLL(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.EnableDLL(_sudokuDLL =! _sudokuDLL);
+        }
+
+        // Solve the sudoku puzzle
+        private void MenuItem_Solve(object sender, RoutedEventArgs e) 
+        { 
+            _mainViewModel.SolvePuzzle();
+        }
+
+        // Solve the sudoku puzzle partially
+        private void MenuItem_SolvePartially(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.SolvePuzzle(2);
+        }
+
+        // Cheat 
+        private void MenuItem_CheatMode(object sender, RoutedEventArgs e)
+        {
+            _mainViewModel.Cheat(_cheatMode =! _cheatMode);
+        }
+
+        // Exit the application
+        private void MenuItem_Quit(object sender, RoutedEventArgs e)
+        {
+            Application.Current.Shutdown(1);
+        }
+
+        // This method will check what to do if a key is pressed
+        private void mainGrid_PreviewKeyDown(object sender, KeyEventArgs key)
+        {
+            _mainViewModel.keyPressed(key);
+        }
+
+        private void Window_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs click)
+        {
+            _mainViewModel.mouseClicked(sender, click);
+        }
+	}
+}
\ No newline at end of file
diff --git a/Sudoku_-_View/app.config b/Sudoku_-_View/app.config
new file mode 100644
index 0000000..e365603
--- /dev/null
+++ b/Sudoku_-_View/app.config
@@ -0,0 +1,3 @@
+<?xml version="1.0"?>
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>