How to Play Sudoku

Fill every empty cell so each row, column, and 3×3 box contains 1 through 9 exactly once. Easy starts with 46 filled cells, medium 36, and hard 26; correct entries clear matching peer notes automatically.

Controls

Click or tap a cell, then enter a digit from 1 to 9.
Use arrow keys to move, P for pencil mode, and Delete or Backspace to clear.
Use Control-Z or Command-Z to undo and Escape to pause.

Scoring and Leaderboard

The score is difficulty multiplier × (3,600 − elapsed seconds), with a floor of zero. Easy uses 1×, medium 2×, and hard 3×, so a faster solve preserves more of the available total.

You can play without an account. Score submission asks only for player initials.

An easy WotAI Sudoku puzzle showing the 9 by 9 grid and starting clues — Actual easy puzzle from WotAI Sudoku: 35 cells are removed, leaving 46 starting clues across the 9×9 grid.

Sudoku Tips

Scan completed areas

Rows, columns, and boxes with many given digits usually reveal the next forced placement.

Use pencil marks

Record candidates in uncertain cells; correct entries remove that digit from peer notes automatically.

Do not guess

When stuck, switch to another box and look for a digit with only one legal position.

Sudoku FAQ

How are easy, medium, and hard different?: Easy removes 35 cells, medium 45, and hard 55, leaving 46, 36, or 26 starting clues.
How is the Sudoku score calculated?: Multiply the remaining seconds from a 3,600-second base by 1 for easy, 2 for medium, or 3 for hard.
Can I use notes and undo mistakes?: Yes. Press P for notes, watch correct entries clear matching peer notes, use Control-Z or Command-Z to undo, and rely on conflict highlighting.

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