Hidden Single
A digit guaranteed to appear somewhere in this run has only one cell left that can hold it.
How it works
- 1The 22-in-three across run has two combinations, 5+8+9 and 6+7+9, so a 9 turns up in it either way.
- 2The first cell heads a 9-in-two down run, and a 9 there would need a 0 beside it — so that cell tops out at 8.
- 3The second heads an 8-in-two down run, so it tops out at 7 for the same reason.
- 4The run's guaranteed 9 has only the third cell left to live in. Place it.
- Cells that establish the pattern
- Where the conclusion lands