File list (Check if you may need any files):
Sudoku\Sudoku.sln
......\Sudoku.suo
......\Sudoku
......\......\ClassDiagram1.cd
......\......\Form1.cs
......\......\Form1.Designer.cs
......\......\Form1.resx
......\......\Program.cs
......\......\Properties
......\......\..........\AssemblyInfo.cs
......\......\..........\Resources.Designer.cs
......\......\..........\Resources.resx
......\......\..........\Settings.Designer.cs
......\......\..........\Settings.settings
......\......\Sudoku.csproj
......\......\SudokuCell.cs
......\......\SudokuCellGroup.cs
......\......\SudokuColumn.cs
......\......\SudokuControl.cs
......\......\SudokuControl.Designer.cs
......\......\SudokuControl.resx
......\......\SudokuGame.cs
......\......\SudokuLine.cs
......\......\SudokuSolveStep.cs
......\......\SudokuSquare.cs