Even though it is the only Sudoku game here, it is still a great little program. If you like sudoku and want your users to enjoy it, too, get this. Has levels of difficulty, clean interface, easy installation. The only reason for not giving an excellent is that it could contain a few more features, such as hints on or off, pencil marks, timer on or off, high or best personal score and maybe a couple of others. Regardless, of the wishlist, it plays very well and fulfills the sudoku addiction. I play it daily.