Sudoku

Unique-solution puzzles in four difficulties, plus a daily one. Notes and hints.

0/6achievements

0:000 mistakes

Best times, easy

No scores yet on this device. The first one is yours.

Saved in this browser only. Nothing is uploaded.

How to play

Fill the grid so every row, column and 3 x 3 box contains the digits 1 to 9 once each. Every puzzle has exactly one solution, checked when it is generated.

Easy and medium puzzles can be solved with singles alone. Hard and expert ones need pairs, pointing and other techniques, but never guessing.

Wrong digits are shown in red and counted. Pencil marks clear themselves when you place a digit nearby.

Controls

1 to 9: Place a digit
Arrows: Move
N: Toggle pencil marks
Backspace: Erase
Ctrl Z: Undo

Achievements0/6

Warm up +25Solve an easy puzzle.
Logician +40Solve a medium puzzle.
Deduction +80Solve a hard puzzle.
No guessing +120Solve an expert puzzle.
Clean build +40Solve any puzzle with no mistakes.
Daily puzzle +30Solve a daily puzzle.

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