Face off with a master.
Don't settle when it comes to your Sudoku: Serious Sudoku lovers choose puzzles hand-crafted by Nikoli, the Japanese company that invented the game. Every puzzle in this calendar is hand-crafted by the best Sudoku makers in the world--not from a computer--to balance toughness and solvability and keep you hooked. The week begins with the easiest puzzles and the difficulty increases day by day. Just in case you need...
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Games