Completed Island
Once an island's marked cells already equal its clue, every cell around it is sea.
How it works
- 1The 2 already has both of its cells — the clue and the mark directly below it — so this island is finished.
- 2Anything else touching it would join it and push it past its own number.
- 3Its three remaining neighbors are therefore all sea.
- Island (land)
- Sea
- Cells that establish the pattern
- Where the conclusion lands