Every puzzle here has exactly one solution, and you never have to guess — each one can be solved by reasoning alone. Pick from eight ways to play: the classic 9×9 grid, a quick 6×6 Mini for short breaks, Killer with its cage sums, Irregular with free-form regions, X-Sudoku, Windoku, Even-Odd, and a roomy 12×12 Large board. Six difficulty levels run from a gentle Easy up to Grandmaster, where the hardest solving techniques come into play.
New to sudoku, or stuck between Hard and Expert? Start with our How to Play guide, learn the named solving moves in Techniques, or see how puzzles are graded in Difficulty Levels. Then come back and put it into practice — the puzzle is waiting above.