Can islands touch diagonally?
Yes, only orthogonal touching is forbidden.
Why are 2x2 ocean squares banned?
That rule prevents trivial solutions and forces interesting ocean shapes.
What does the number include?
The number cell plus all connected white cells in that island.
Can ocean touch itself across a corner?
Diagonally yes, but orthogonal connection is what matters for continuity.
Is Nurikabe hard to learn?
The rules are simple, but the deductions can be subtle. Start with small grids.
