Choose your difficulty
Select a difficulty level to start playing. All puzzles are free, generated instantly, and have a unique solution.
😊
Easy
55% filled
🙂
Medium
40% filled
😤
Hard
30% filled
🧠
Expert
22% filled
🔥
Master
17% filled
💀
Extreme
12% filled
About 9×9 Sudoku
The classic 9×9 Sudoku — 81 cells, numbers 1–9, nine 3×3 boxes. The most played format worldwide. All puzzles on SudokuMaster.org are algorithmically generated with a guaranteed unique solution. No registration, no downloads — just click and play.
Tip: New to Sudoku? Start with Easy difficulty and use the Notes feature to track candidate numbers as you narrow down each cell.
Other grid sizes
Frequently asked questions
What are the rules for 9×9 Sudoku?
Fill every row, column and box with numbers 1 to 9 so each number appears exactly once. Same rules as classic Sudoku — just a different grid size.
Is there a time limit?
No. There is no time limit. The timer shows how long you have been playing, but you can take as long as you need.
Can I save my progress?
Yes. Your puzzle is automatically saved every 15 seconds. If you close the tab and come back, your progress will be restored.