Walkthrough 1 - Medium
Step 3
| 1 | 6 | 2 | ||||||
| 5 | 3 | 8 | ||||||
| 4 | 5 | 6 | 9 | |||||
| 3 | 6 | |||||||
| 8 | 1 | 5 | ||||||
| 5 | 7 | |||||||
| 2 | 8 | 3 | ||||||
| 5 | 1 | |||||||
| 9 | 5 | 6 |
Now this one is a bit complex so stay with me.
If we look at the top 3 boxes we can see the two 5s in rows 2 and 3 means there has to be a 5 in either the top left or top right in box 3 (indicated by yellow boxes on the chart below).
Again on the botton 3 boxes the 5s on the bottom two rows means there has to be a 5 in the top left or right in box 9 (again indicated by yellow boxes)
This means there has to be a 5 in the centre column in box 6. As there is a 5 on the bottom row in box 4 the 5 has to be in the centre square of box 6.
