//Vytvoří nový SudokuBoard dle zadané obtížnosti
public static SudokuBoard Create(int difficulty)
{
SudokuBoard board = new SudokuBoard();
int number;
switch (difficulty)
{
case 1:
default:
number = 28;
break;
case 2:
number = 32;
break;
case 3:
number = 38;
break;
case 4:
number = 42;
break;
}
board = board.GetSolution().Clone();
board.CutCells(number);
return(board);
}