Nurikabe Demo — GridPaw

Solved!

Your board

💔

Out of hearts

Three wrong marks — this board got away from you.

How to play Nurikabe

A finished board: every island holds exactly its number · the sea is one connected mass · no 2×2 sea.

👆 How to Play

Tap a cell to cycle it: unknown → sea ≈ → island. Clue cells (with the little island) are fixed.

Rule 1 · Islands

Each number is the exact size of its island. An island is a connected group of white cells holding exactly one number. Two islands never share an edge.

Rule 2 · The sea

All black cells (the sea) must form one single connected area.

Rule 3 · No 2×2 sea

Four black cells in a square are forbidden — three sea cells around one corner force the fourth to be island.

Win

A full, consistent board wins. Wrong marks are warned, never locked.

The 4 tutorials teach each rule one at a time — skip them anytime with “Skip tutorial »”.