How do I start a sudoku?

Look for a row, column or box that is nearly full, and for digits that can only go in one cell of a box. Notes help on the harder levels.

Can I undo a mistake?

Yes. Undo takes back your last moves, and notes can be added or cleared at any time.

Yes. It is free to play in your browser, with no download and no account needed. Sign in with LogosVox only if you want your saves and best scores on every device.

All games

Logos Sudoku

Fill the grid so every row, column and box holds 1 to 9. Notes, undo, three levels.

Players: Solo
Modes: Solo
Languages: English, Turkish

Play

Logos Sudoku is the classic nine by nine logic puzzle. Pencil in notes, undo a move, and pick the level that suits you.

How to play

Pick a level: easy, medium, hard or expert.
Select an empty cell and place a digit from 1 to 9.
Each row, column and 3x3 box must hold every digit exactly once.
Turn on Notes to pencil in the digits a cell could still be.
Stuck? Undo a step back, or ask for a hint.

Keyboard

Arrow keys: Move between cells
1-9: Place a digit
Backspace / Delete / 0: Erase
N: Notes on or off
Z / U / Ctrl + Z: Undo
H / P: Hint / Pause

Phone

Tap a cell: Select it
Tap a number below: Place it
Notes: Pencil marks on or off
Erase / Undo: Clear a cell / step back
Hint: Fill one cell for you

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Credits and licence

Licence: MIT Source: github.com/robatron/sudoku.js Credits

Questions and answers

How do I start a sudoku?: Look for a row, column or box that is nearly full, and for digits that can only go in one cell of a box. Notes help on the harder levels.
Can I undo a mistake?: Yes. Undo takes back your last moves, and notes can be added or cleared at any time.
Is it free?: Yes. It is free to play in your browser, with no download and no account needed. Sign in with LogosVox only if you want your saves and best scores on every device.