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Sudoku
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Sudoku

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About Sudoku

Sudoku is the world's favourite number puzzle. Fill the 9×9 grid so every row, column and 3×3 box contains the digits 1 to 9 exactly once.

Every puzzle is freshly generated with exactly one solution. Use notes to pencil in candidates, and watch the number pad to see which digits are still left.

How to play Sudoku

Select a cell and type a number, or use the on-screen number pad. Turn on Notes to add small candidates. Five mistakes and the puzzle is lost.

Controls

Click cellSelect
1–9Enter number
NToggle notes
BackspaceErase
Arrow keysMove

Features

  • Unlimited unique puzzles
  • 3 difficulty levels
  • Pencil notes
  • Highlighting of related cells
Easy to jump intoDesktop & mobileBeat your best scoreFree forever

Categories: Puzzle games, Board games · Tags: sudoku, numbers, logic, brain · Added November 10, 2026

Sudoku FAQ

Does every Sudoku have one solution?

Yes, every generated puzzle is checked to have exactly one solution.

How do I enter notes?

Switch on Notes (or press N) and type the candidate numbers.

Can I play Sudoku on mobile?

Yes. Sudoku runs in any modern mobile browser on iPhone, iPad and Android, with touch controls where needed.

Do I need to download Sudoku?

No. Sudoku is an HTML5 game that runs instantly in your browser — no download, no install and no account required.

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