Free Sudoku Online

Play Sudoku online free! Classic number puzzle game with easy, medium, hard & expert levels. No download, no registration. Unlimited puzzles with hints & auto-check. Works on all devices instantly.

How to play Sudoku

1. Fill every row with the digits 1 through 9 without repeats.
2. Fill every column with the digits 1 through 9 without repeats.
3. Make sure each 3 by 3 box also contains every digit exactly once.

Game features

• 100% Free - No download, no registration, no ads interruption
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• All Difficulty Levels - Easy, Medium, Hard, Expert puzzles
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• Instant Play - Works in your browser on any device immediately
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• Smart Features - Auto-notes, hints, error checking, undo/redo
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• Track Progress - Timer, statistics, daily challenges, achievements
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• Mobile Optimized - Touch controls for phones & tablets, portrait/landscape
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• Customizable - Number highlighting, themes, pencil marks
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• Offline Play - Continue playing even without internet connection
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• Unlimited Puzzles - New puzzles generated every time you play
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