Steps 4-6
| Step 4 | ||
 |
Simple Elimination The purple highlighted square is missing the number 1. The red highlighted 1 eliminates all but one of the empty tiles, so that tile must be 1. |
 |
| Step 5 | ||
 |
Simple Elimination The purple highlighted square is missing the number 7. The red highlighted 7 eliminates all but one of the empty tiles, so that tile must be 7. |
 |
| Step 6 | ||
 |
Single Possibility The purple highlighted square is missing the number 5. There is only one empty tile, so it must be the 5. |
 |