Sudoku
Solve a 9x9 Sudoku puzzle with notes mode, timer tracking, autosave, and keyboard controls.
Solve Sudoku in 3 steps
Choose difficulty, place numbers, and resume anytime.
- Pick levelChoose easy, medium, or hard.
- Use notesAdd pencil marks before final answers.
- Resume laterAutosave keeps the timer and board.
Sudoku board
Place clean answers, use notes when needed, and keep the board readable.
Shape the solve
Pick a level and choose the helper behavior.
- Best
- No record yet
- Filled
- 39/81
- Mistakes
- 0
- Level
- Medium
Sudoku leaderboard
Save your display name once, no-hint Sudoku solves can appear here.
No ranked finishes yet for Medium. Choose another category or complete an eligible round.
Pause now and continue later
Notes, elapsed time, and the current board are saved in this browser, so you can leave an unfinished puzzle and continue later.
FAQs
Can I keep an unfinished puzzle?
Yes. The current board, timer, and notes are saved automatically on this device.
How does Notes mode work?
Turn it on, select a cell, and enter digits to add or remove pencil marks inside that square.
Can I use the keyboard?
Yes. Arrow keys move between cells, number keys enter values, and backspace clears a cell.
Do best times save by difficulty?
Yes. Easy, medium, and hard each keep their own best time record.
How do Sudoku leaderboard scores work?
Only solved puzzles without hints can enter the leaderboard. Hinted solves still update your personal progress.
Does it work well on mobile?
Yes. The board scales down and still keeps the cells large enough to tap comfortably.