Sudoku
- Developer
- Quokka Labs
- Genre
- Logic puzzle
- Released
- September 2026
- Play time
- 5–20 min
- Controls
- Mouse, touch, or keyboard
- Platform
- Browser (desktop, mobile, tablet)
Fill every row, column and 3×3 box with the digits 1 to 9. Every puzzle is freshly generated with exactly one solution across Easy, Medium, Hard and Expert, plus a new Daily Challenge each day. Pencil in notes, undo, grab a hint, and watch rows and boxes light up as you complete them. Three mistakes ends the game unless you switch the limit off, and your in-progress puzzle, best times and wins are saved on this device.
How to play
Pick a difficulty or the Daily Challenge. Select a cell, then choose a number from the pad. Each row, column and 3×3 box must contain 1–9 exactly once. Turn on Notes to pencil in candidates, use Undo or Erase to fix entries, and Hint to reveal one correct cell (3 per game). Wrong numbers count as mistakes; three mistakes ends the game unless the limit is turned off.
Controls
Tap or click a cell, then a number. Keyboard: arrow keys move, 1–9 fill (Shift+digit adds a note), N toggles notes, Backspace/Delete erases, Z undoes, H gives a hint, Esc or P pauses.
Tips and strategy
- Harder puzzles pay more per correct digit: 10 on Easy, 20 on Medium, 35 on Hard and 50 on Expert, plus double that for each row, column or box you complete.
- Solve quickly for a bigger win bonus; the speed part of the bonus shrinks as your time approaches the par time for that difficulty.
- Each mistake lowers the win bonus, and Undo never refunds mistakes, so use Notes to test ideas instead of guessing digits.
- When you place a correct digit, it is automatically removed from the notes in the same row, column and box, so keep candidates penciled in.
- Hints reveal a correct cell but score no points, so save your three hints for spots where you are truly stuck.
Sudoku FAQ
What difficulty is the Sudoku Daily Challenge?
It rotates by weekday: Monday is Easy, Tuesday and Wednesday are Medium, Thursday and Friday are Hard, Saturday is Expert and Sunday is Medium. The puzzle is generated from the date, so it is the same for everyone that day.
Does Undo remove mistakes in Sudoku?
No. Undo restores the board and your notes, but the mistake counter, score and hints used are never refunded.
Can I play Sudoku without the three-mistake limit?
Yes. Turn the mistake limit off in the options; wrong numbers are still counted, but they never end the game.
How is the Sudoku score calculated?
Each correct digit earns points based on difficulty, completing a row, column or box earns a bonus, and solving the puzzle adds a win bonus that grows with speed and shrinks with each mistake. Hinted cells score nothing.
Privacy and saves
No account is needed. Settings, statistics, and your in-progress puzzle are stored only in this browser's localStorage. In-game ads are served by Google AdSense, which may use cookies; see the Quokka Games privacy policy.
A Quokka Labs original browser game · Free to play · No download