Sudoku is the classic number logic puzzle. Fill the 9×9 grid so that every row, column and 3×3 box contains each digit from 1 to 9 exactly once. Pencil in notes, ask for a hint when stuck, and try to finish without making three mistakes.
How to play
- Choose Easy, Medium or Hard.
- Select an empty cell and enter a digit from 1 to 9.
- Each row, column and 3×3 box must contain every digit exactly once.
- Turn on Notes to pencil in possible digits.
- Three mistakes and the puzzle is over.
Controls
- Computer
- Click a cell and type a digit, or move with the arrow keys. N toggles notes, H gives a hint, and Backspace or 0 erases.
- Phone and tablet
- Tap a cell, then tap a number on the keypad. Use the Notes, Erase and Hint buttons below the grid.
Tips
- Start with rows, columns and boxes that are nearly full.
- Use notes to track candidates in tricky cells.
- If a digit can only go in one place in a box, place it.
Questions
- What happens if I make a mistake?
- The mistake counter goes up. After three mistakes the puzzle ends.
- Is there a timer?
- Yes. Your solving time is shown, so you can try to beat your best.