Sudoku
Fill the 9×9 grid so every row, column and box holds 1 to 9. One shared daily board plus unlimited easy to expert puzzles.
One daily 9×9 grid, logic only — no guessing required. Play Sudoku instantly in your browser — no download or account.
How to play
- Place 1 to 9 so each digit appears once in every row, column and 3×3 box.
- Start from cells with the fewest candidates; a single remaining digit is always safe.
- Switch on pencil notes to track candidates before committing to a number.
- Finish the daily board to extend your streak, or start an unlimited puzzle at any level.
Controls
Click a cell or move with the Arrow keys, then type 1–9. N toggles pencil notes and Backspace clears a cell.
Tap a cell, then a number on the keypad. Use the pencil button for notes and the eraser to clear a cell.
About Sudoku
Sudoku on ito.gg gives everyone the same medium board each UTC day, so your solve time compares directly with friends who play the same date.
Every puzzle is generated in your browser and checked to have exactly one solution, so careful logic always reaches the answer without trial and error.
Outside the daily board, unlimited mode deals fresh easy, medium, hard and expert grids. Your progress, notes and streak stay on this device.
FAQ
Is Sudoku on ito.gg free?
Yes. Every board is free to play in the browser with no account or download.
Does each puzzle have a single solution?
Yes. The generator removes clues one at a time and keeps a removal only if the grid still has exactly one solution.
How does the daily sudoku work?
Everyone gets the same medium board for the current UTC day. Solving it extends your daily streak; a new board appears at 00:00 UTC.
Can I write candidate notes?
Yes. Turn on pencil mode to add small candidate digits to a cell, then turn it off to place a final number.
Is my progress saved?
Your board, timer and streak are kept in this browser, so you can close the tab and continue the same day.
Enable JavaScript to play. Choose Play to start your solo game.
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