Nurikabe

Paint cells black or white so every clue is a tidy island.

  1. Tap a cell to paint it black (wall). Tap again to paint it white (island). Tap once more to clear.
  2. Every numbered clue is part of a white "island" of exactly that many cells, connected by edges.
  3. Two islands can't share an edge (corner-touching is fine).
  4. All black cells must connect into one big group.
  5. Black cells can never form a 2×2 square.

A tiny board you can experiment on.

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