Description, walkthrough, how to play in this game:Sudoku, another name: Number Place - it's a popular math puzzle game. You can choose difficulty of the game: Easy (default mode) or Hard. Fill all empty cells. Digit must be unique on horizontal, vertical and diagonal line. Digits may be changed in any time, as you wish. All big cells have sub-cells. So, you can to try to fill all of the small cells too. (Control keys of this game you can see above)