Sudoku

- Generate sudoku puzzles with 3 difficulty levels.

- Choose a 'value domain' (numbers 1-9, characters a-i, or special characters).

- Enter a new sudoku puzzle.

- 'Play' the sudoku.

- Show or hide possible values in the empty cells.

- Let the computer solve it.

- Save a sudoku in its actual state.

- Load or delete a formerly saved sudoku.