Tuesday, February 9, 2021

Puzzlerium tour: Nurikabe (National Security)





Rules: Shade some cells so that all shaded cells are connected and no 2×2 square is completely shaded. Cells with numbers cannot be shaded. Each group of connected unshaded cells forms an island; islands can touch each other diagonally. Each island must contain exactly one given number, and that number indicates the sum of areas of ALL of the islands that touch (diagonally) the island it belongs to. 

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