Play normal Sudokus but also big Sudokus (12x12 en 16x16). For the big Sudokus you have to use additional letters besides the numbers 1-9. Use the Editor to create your own Sudoku.
How to play sudoku games:
There is really only one rule to Sudoku: Fill in the game board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 box. The numbers can appear in any order and diagonals are not considered. Your initial game board will consist of several numbers that are already placed. Those numbers cannot be changed. Your goal is to fill in the empty squares following the simple rule above.