1
Using numbers from 1 to 9, fill in the empty cells, following these rules:
- Unique numbers (1 to 9) in each row
- Unique numbers (1 to 9) in each column
- Unique numbers (1 to 9) in each 3x3 block
2
If you get stuck, you may double click a cell to auto-fill it. This will cost you one life line. Up to 3 life lines are available per puzzle.
3
You can not change the value of the pre-filled cells (cells with values in gray color).
