The rules to sudoku are very simple: fill in the grid so that every row, every column and every 3x3 box contains the digits 1 through 9. there is nothing more to it! there are 75 levels in total, split up into the categories easy (1-25), medium (26-50) and hard (51-75). there is a timer, but no limit, so you can play at your own leisure or put yourself under pressure and challenge your friends.
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