Free Online Sudoku – 9×9 Puzzles
Play unlimited free Sudoku puzzles online. Our Sudoku game features multiple difficulty levels and helpful tools.
Game Features
- Unlimited 9×9 puzzles
- Undo/Redo support
- Hint system
- Auto-save progress
How to Play Sudoku
Fill the 9×9 grid so that each row, column, and 3×3 box contains digits 1-9 without repetition.
Free Online Sudoku – 9×9 Puzzles — questions
Are these Sudoku puzzles randomly generated?
Yes. Each puzzle is generated fresh with a guaranteed unique solution. You’ll never see the same puzzle twice in a normal session, so there’s effectively unlimited Sudoku to play.
How do I get a hint when I’m stuck?
Tap the hint button to reveal one correct number in an empty cell. Use hints sparingly — they’re most useful when you’ve hit a logical dead end and want to see the next deduction step.
Can I undo a wrong move?
Yes. The undo button reverses your last action, and you can keep undoing back to the start of the puzzle. Combine undo/redo with hints to learn the solving techniques behind tricky cells.
Is my Sudoku progress saved if I close the tab?
Your current puzzle state is kept in your browser’s local storage, so you can close the tab and pick up where you left off later on the same device and browser.
Why play Sudoku online instead of on paper?
Speed and forgiveness. Digital Sudoku lets you mark candidates, undo mistakes instantly, and skip puzzles you don’t enjoy — all without an eraser. Great for daily cognitive practice during commutes or coffee breaks.
Is PickerSpin Sudoku free with no ads?
Yes. No signup, no subscription, no banner ads interrupting your solving. We built it for people who just want clean Sudoku in 2 seconds, on any device.