The objective of the game is to populate each field in the puzzle with a number ranging from 1 to 9. This has to be done in such a way that each number appears only once per row, once per column and once per zone. Because all these elements consist of 9 fields, all the numbers between 1 and 9 should be used (once) in each element.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 9 | 4 | 5 | ||||||
| 8 | 6 | 7 | ||||||
| 7 | ||||||||
| 6 | ||||||||
| 5 | ||||||||
| 4 | ||||||||
| 3 | ||||||||
| 2 |