Sudoku

Fill every row, column, and box with numbers 1–9

Errors
0/3
Time
0:00
Best
—

About Sudoku

Sudoku is one of the world's most popular logic puzzles, appearing daily in newspapers, apps, and puzzle books globally. Despite using numbers, it requires zero arithmetic — the digits 1–9 are simply symbols. Each puzzle is freshly generated with a guaranteed unique solution.

This version features three difficulties, a pencil-note mode, 3-error limit, and personal best times saved locally per difficulty.

How to Play

  • Click any empty cell to select it
  • Type or click a number (1–9) to place it
  • Each row, column, and 3×3 box must contain 1–9 with no repeats
  • Blue numbers are given clues and cannot be changed
  • Use Notes mode (✏) to mark candidate numbers in pencil
  • Arrow keys navigate between cells; P toggles notes mode

Frequently Asked Questions (Sudoku Unblocked)

Can I play Sudoku Unblocked on school Wi-Fi?

Yes! Sudoku Unblocked runs directly in HTML5 without requesting external restricted servers, making it 100% playable on school Wi-Fi and Chromebooks.

Is Sudoku completely free to play?

Absolutely. All games on UnblockedGamesSchool are completely free to play with no downloads, subscriptions, or paywalls.

How are my best scores saved?

Your highest score and personal records are automatically stored safely inside your device's browser memory (localStorage).

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