Sudoku
Solve a 9x9 Sudoku puzzle with notes mode, timer tracking, autosave, and keyboard controls
Solve Sudoku
Choose difficulty, place numbers, and resume the puzzle 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
- 33/81
- Mistakes
- 0
- Solver rating
- Mixed logic
Sudoku leaderboard
Complete a puzzle to add its time to the selected difficulty leaderboard. Hints are allowed.
No ranked finishes yet for Medium. Choose another category or complete an eligible round.
Play a solver-validated puzzle
Every generated board is checked for exactly one solution and receives a solver-effort rating. Notes, elapsed time, and the board still save automatically.
FAQs
Can I keep an unfinished puzzle?
Yes. The current board, timer, and notes are saved automatically.
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 are puzzles validated?
A solver checks every clue removal and accepts the generated board only while exactly one solution remains. The score panel shows the resulting solver-effort rating.
How do Sudoku leaderboard scores work?
Every solved puzzle can enter its difficulty leaderboard, including games that use hints.