How to play
- Fill the grid so every row, every column and every 3 by 3 box has the digits 1 to 9 once.
- Tap a square, then tap a number. Turn on Notes to jot small pencil marks instead.
- A digit turns red if it clashes with another in its row, column or box. That doesn't always mean it's wrong, but something is.
- There's one daily puzzle, the same for everyone. Practice is unlimited, in three levels.
- Every puzzle has exactly one answer. The timer only runs while this page is open.