Play sudoku online free, right now. Pick a level above, and you can change it at any time from inside the game. Every puzzle is generated fresh and has exactly one solution, so the logic always leads somewhere. There is nothing to download, and your progress is saved as you go.
Pick a sudoku level
Easy
About forty givens, solved with simple singles. A relaxed place to start, or to unwind.
Medium
Fewer givens, where pencil notes and classic pair techniques often come into play. The sweet spot for regular solvers.
Hard
Around twenty-six givens and deeper logic, with patterns like X-Wing sometimes coming into play. For experienced solvers.
The rules in thirty seconds
Fill the grid so that every row, every column and every 3 by 3 box contains the digits 1 to 9 exactly once. You never add, subtract or guess. Each number is placed because the other digits make it the only possibility.
Tools that help
- Pencil notes for tracking candidate numbers in each square.
- Highlighting of the row, column, box and matching digits of the selected square.
- Optional mistake highlighting, which you can turn off for a stricter game.
- Hints that explain the kind of logic first, then fill the square if you ask again.
- Undo, a pause button and a Large mode with bigger numbers.
- Keyboard control: arrows to move, 1 to 9 to enter, N for notes and U to undo.
Why sudoku suits a calm routine
Sudoku asks for focus without any time pressure unless you add it yourself. A single puzzle takes from a few minutes to half an hour, which makes it easy to fit into a break. Many players keep a regular level and move up slowly as techniques become familiar. If you enjoy card games as well, try the solitaire hub for the same patient, step-by-step feeling.
Common questions
Is online sudoku free?
Yes. All puzzles are free, with no sign-up and nothing to install.
Does every puzzle have a unique solution?
Yes. Each puzzle is checked by a solver to confirm that exactly one solution exists.
Which level should I start on?
Try easy first. When you finish without hints, move on to medium.
Can I use pencil marks?
Yes. Switch on Notes and tap numbers to add or remove candidates in the selected square.
Can I play with a keyboard only?
Yes. Tab to the grid, use the arrow keys to move, and type 1 to 9 to fill squares.