| a | b | c | d | e | f | g | h | i | |
| A | 8 | 256 | 3 | 4 | 26 | 256 | 1 | 9 | 7 |
| B | 14 | 146 | 46 | 13689 | 13689 | 7 | 2 | 48 | 5 |
| C | 1245 | 9 | 7 | 158 | 128 | 25 | 3 | 48 | 6 |
| D | 1239 | 12368 | 5 | 3689 | 7 | 369 | 4 | 128 | 1289 |
| E | 49 | 7 | 4689 | 2 | 4689 | 1 | 5 | 3 | 89 |
| F | 12349 | 12348 | 489 | 389 | 5 | 349 | 6 | 7 | 1289 |
| G | 3459 | 3458 | 489 | 1359 | 12349 | 23459 | 7 | 6 | 123 |
| H | 7 | 345 | 1 | 3569 | 23469 | 234569 | 8 | 25 | 23 |
| I | 6 | 35 | 2 | 7 | 13 | 8 | 9 | 15 | 4 |
There are no squares that can be solved with the Only Choice; Only Square and Single Possibility rules. Shared sub groups and Twins do not help either. The choice is to try advanced strategies that take an age to work through or go for a guess.
Stopped. Press the Play button to automatically run through the tutorial. Help page.