- A 1 island must be surrounded by ocean on all four sides.
- Mark cells that would connect two islands as ocean.
- Avoid creating 2x2 black squares; they are always illegal.
- Ocean must stay connected, so do not strand black cells.
- An island of size N can never be larger than N cells.
- Use the no-diagonal-touch rule to separate close island numbers.
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Categorypuzzle
Difficultymedium
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