In Sudoku there are only a few basic rules. You have to fill in the 9 x 9 number grid so that every row, every column and every 3 x 3 box contains the numbers 1 through 9, which means that there cannot be an overlap of numbers in any row, column or 3 x 3 box. You can also play Soku - a speed version of Sudoku. In Soku there is an additional rule that states that every row or column in any 3 x 3 box contains the same set of numbers.
Both versions of the game randomly generate the number grids, so they will be different each time you play. See the instructions in the game for further details of how to play. Your high scores for each difficulty level of Sudoku and Soku will be remembered for the next time you play the game, but only if you play it in this website again.
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