Game input is disabled while help is open.
Controls
- Pick a cell
- Click or tap, or the arrow keys
- Enter a digit
- 1–9 or the number pad
- Erase
- Backspace, Delete or 0
- Notes
- N, or the Notes button
How to play
Fill the grid so every row, column and 3×3 box holds 1 to 9 once. Every puzzle is generated fresh and checked to have exactly one solution.
Fresh puzzlesEach puzzle is generated in your browser from a random full grid, removing digits one at a time and keeping a removal only while a solver confirms there is still exactly one solution. Easy leaves about 40 clues, Expert about 24.
Help, not answersRed cells break a rule (a repeat in a row, column or box); the game never tells you a digit is wrong just because it differs from the solution. Placing a digit clears it from the notes it rules out.
Best timesOne best per difficulty, kept on this device. Games where you used a hint still finish but don't count toward your best.
1 player · Keyboard · Mouse · Touch
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