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9×9 Sudoku
A 9×9 grid, nine 3×3 boxes, the digits 1 to 9: the classic Sudoku the whole world plays, free in your browser and fresh on every game.
Play 9×9 Sudoku free →The original Sudoku grid
A standard Sudoku is 9×9: fill every empty cell so each row, each column and each 3×3 box contains the digits 1–9 exactly once. It's the format used in newspapers and championships, and the one most people mean by "Sudoku."
- Four difficulty levels: Easy, Medium, Hard and Expert.
- Pencil notes, hints, undo and redo built in.
- Shareable puzzle links, so you can send a friend the exact same board.
- Dark mode, keyboard support, auto-save, and no sign-up.
Prefer something smaller?
Playoku also offers 6×6 and 4×4 grids. The smaller boards are perfect for a quick solve or for learning — see Sudoku for kids. New to it all? Start with how to play Sudoku.
Frequently asked questions
What are the rules of 9×9 Sudoku?
Fill every empty cell so that each of the nine rows, nine columns and nine 3×3 boxes contains the digits 1 to 9 exactly once. No digit may repeat within a row, column or box.
How many clues does a 9×9 Sudoku have?
It depends on difficulty. Easy boards start with around 36–40 given digits; expert boards can have as few as 22–24. Every Playoku board, however many clues, has exactly one solution.
Is 9×9 the standard Sudoku size?
Yes. The 9×9 grid is the classic format used in newspapers, apps and world championships — it is what most people mean by the word "Sudoku."