Sudoku
Classic 9×9 sudoku puzzle with hints and check.
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Play Sudoku Free Online
Classic 9×9 Sudoku puzzle with multiple difficulties, hints, and error checking. Train your logic skills.
How to use this tool
- 1
Pick a difficulty
Easy to expert.
- 2
Fill each row, column, & box
Use digits 1–9 with no repeats.
- 3
Use hints if stuck
Limited hints per puzzle.
Pro tips
- Look for cells with only one possible value first.
Frequently asked questions
Are puzzles unique?
Yes — each puzzle has exactly one solution.