Fill every row, column and 3×3 box with the numbers 1 to 9. Use the keyboard numbers and arrow keys, N for notes.
The famous number puzzle. Fill the nine by nine grid so that every row, every column and every three by three box holds the numbers one to nine exactly once. Every puzzle is freshly made and has exactly one answer. Use notes to pencil in possible numbers, ask for a hint if you get stuck, and try to finish without three mistakes. Pick easy, medium or hard.
| Click a square, then a number | Fill it in |
| 1 to 9 / arrows | Use the keyboard |
| N | Notes on or off |