Nurikabe
Shade the walls, leave the islands — no pools allowed.
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How to play Nurikabe
Each number is an “island” of that many unshaded cells. Shade the rest to form the “wall” — a single connected sea — so that every island is the exact size its number says, islands never touch each other side-by-side, and the wall never forms a solid 2×2 block. Deduce the only valid shading as fast as you can.
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Nurikabe — frequently asked questions
What does each number mean?
It’s the exact number of unshaded cells in that island, counting the numbered cell itself.
What’s the 2×2 rule?
The shaded wall may never fill a complete two-by-two square anywhere on the board.
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