Sudoku

How to play

1. 01Fill the empty cells with numbers from 1 to 9.
2. 02Each number appears only once in every row, every column and every 3 × 3 box.
3. 03Every puzzle has a single solution and can be solved by logic alone: no guessing needed.

Tips

• Turn on notes to pencil in a cell's candidates. When you place a number, it is removed from the notes in its row, column and box.
• Keyboard: numbers 1–9, arrows to move, Delete or Backspace to erase, N for notes and Ctrl+Z to undo.
• Your progress is saved in this browser. Leave a puzzle half-done and pick it up another day.