Sudoku
Fresh Sudoku puzzles with a single solution, hints and a timer.
Runs in your browser. Nothing you enter is sent or stored.
How to use Sudoku
- Choose a difficulty and press New puzzle.
- Fill every row, column and 3×3 box with the digits 1–9, each exactly once.
- Clashing digits turn red. Stuck? Use a hint.
Frequently asked questions
Does every puzzle have one solution?
Yes. Each puzzle is generated fresh in your browser and checked to make sure it can be solved in exactly one way.
How do I play on a keyboard?
Click a cell and type 1–9. Use the arrow keys to move and Backspace to clear.
Is Sudoku free?
Yes. Sudoku is free to use with no sign-up and no watermark.
Is my information saved or sent anywhere?
No. Everything is calculated in your browser. Nothing you enter is sent to a server or stored.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.