Sudoku
Fill the 9×9 grid so every row, column and box has 1–9. Four difficulties, notes and hints.
How to play
- Tap a cell, then pick a digit from the number pad or press 1–9 on your keyboard.
- Every row, column and 3×3 box must contain each digit from 1 to 9 exactly once.
- Turn on Notes to pencil in small candidate marks instead of a final answer.
- Use Hint to reveal the correct value of the selected cell, or Check to flag mistakes.
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About Sudoku
Sudoku is the world’s best-known logic puzzle: fill a 9×9 grid so that every row, every column and every 3×3 box contains the digits 1 through 9 exactly once. Though number-based, it needs no arithmetic — only deduction. The modern form was popularized in Japan in the 1980s, where it got its name, before conquering newspapers worldwide in the 2000s.
Here you can play sudoku online free at four difficulty levels — Easy, Medium, Hard and Expert — with a notes mode for pencil-marking candidates, a hint button that reveals the selected cell, a checker that flags mistakes and a timer that records how fast you solve. It all runs in your browser without any sign-up.
How to use Sudoku
- Pick a difficulty — Easy, Medium, Hard or Expert — and start a new puzzle.
- Tap a cell, then choose a digit from the number pad or press 1–9 on your keyboard.
- Remember the one rule: each row, column and 3×3 box must contain every digit from 1 to 9 exactly once.
- Turn on Notes to pencil in small candidate marks instead of committing to an answer.
- Use Check to flag mistakes or Hint to reveal the correct value of the selected cell.
- Fill the whole grid correctly to finish — your solve time is shown at the end.