Is Sudoku free to play?
Yes. You can play every difficulty for free in your browser.
Preparing puzzle...
How to play Sudoku
- Choose a difficulty and select an empty cell.
- Enter a number from 1 to 9.
- Use Notes to keep possible candidates.
- Fill every row, column, and 3×3 box without repeats.
- Complete the whole grid to solve the puzzle.
Sudoku rules
- Each row must contain 1 through 9 once.
- Each column must contain 1 through 9 once.
- Each 3×3 box must contain 1 through 9 once.
- Given numbers cannot be changed.
- Every generated puzzle has a valid solution.
Frequently asked questions
Are games saved?
Your unfinished puzzle, notes, and time are saved in this browser.
How do Notes work?
Turn on Notes, then tap numbers to add or remove candidates.
Can I undo a move?
Yes. Undo restores the previous board and notes without changing your time.
Does pausing stop the timer?
Yes. The timer stops while the puzzle is paused.
Which difficulties are available?
Easy, medium, hard, and expert puzzles are available.