Sudoku

How to play

1. Fill the 9×9 grid so every row, every column and every 3×3 box contains the numbers 1 to 9 with no repeats.
2. Tap an empty square, then a number on the pad (or press keys 1–9 on a keyboard).
3. Turn on Notes (pencil) to jot small candidate numbers in a square while you think.
4. Use Undo to fix a move, Erase to clear a square, and Hint when you are stuck: it fills one correct square.
5. With "Check mistakes" on, three mistakes end the game. Repeated numbers are highlighted in red.
6. Every puzzle has exactly one solution. Try the Daily Sudoku: the same puzzle for everyone, new every day.

Play Sudoku free online with four difficulty levels (easy, medium, hard and expert) plus a Daily Sudoku. Every board is generated on the spot with a unique solution and graded by the solving techniques it needs. Includes notes, hints, undo, mistake checking, best times and auto-save. Works great on phones and desktops.