Walkthrough 1 - Medium
Step 5
| 1 | 6 | 2 | ||||||
| 5 | 3 | 8 | ||||||
| 4 | 3 | 5 | 6 | 9 | ||||
| 3 | 5 | 6 | ||||||
| 8 | 1 | 5 | ||||||
| 5 | 7 | |||||||
| 2 | 8 | 3 | ||||||
| 5 | 1 | |||||||
| 9 | 5 | 6 |
If we look at the third row we can see that the first box can't be a 3. The third can. The fourth and fifth can't be a 3 due to the 3 on the second row and the eighth can't be a 3 due to the 3 in section 9. Therefore the only box on that row that can be a 3 is the third.
