Sudoku
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How to play Sudoku
Sudoku is the number-placement puzzle with a single rule: each row, each column and each 3×3 box must contain the digits 1 to 9 exactly once. Every puzzle here is generated with exactly one solution.
At a glance
Sudoku is a 9×9 number logic puzzle (81 cells). Fill every row, column, and box with 1–9 without repeating.
- Game type
- Puzzle
- Players
- Single player
- Pieces
- 81 cells
- Best for
- Pure logic
- Tap a square, then tap a number to place it. Tap the same number again to take it back.
- Every row, column and 3×3 box must hold the digits 1 to 9 with no repeats.
- Turn on Notes to pencil in candidates when you are not sure yet.
- Fill all 81 squares correctly to finish the puzzle.
Frequently asked questions
Does every puzzle really have only one solution?
Yes. Each puzzle is generated by removing digits from a complete grid and checking that the puzzle still has exactly one solution after every removal. A digit is only taken away if that is still true.
What is the difference between the three levels?
The difficulty comes from how many squares are left empty: around 40 on Easy, 48 on Medium and 54 on Hard. More empty squares means more of the board has to be worked out by deduction.
What does the Check button do?
It marks any square that does not match the solution for three seconds. If everything you have filled in is correct, it tells you so instead — it never reveals a digit you have not placed.