Sudoku

Classic Sudoku with four difficulty levels, pencil notes, hints and undo.

Every puzzle is generated in your browser and has exactly one solution. Pick a difficulty, select a cell and type 1–9 (or open the on-screen keypad); N toggles pencil notes, Backspace clears a cell, the arrow keys move around and Ctrl/⌘ + Z undoes. Your game, timer and settings are saved locally, so you can close the tab and pick up where you left off.

Level
–
Mistakes
0
Hints
0
Time
00:00

New game

Pick a level.

Restart this puzzle?

The puzzle goes back to its starting cells; the timer, mistakes and hints are reset.

Settings

Mistake limit

The game ends when you reach this many mistakes. A change also applies to the game in progress.

Time
Hints
Mistakes
Level