"Binary Island Systems" is an interesting variant of Nurikabe that combines both diagonal touch and no-touch flavours effectively.
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 area of the island in number of cells. Also, each island is diagonally adjacent to exactly one island.
About: Binary Island Systems was invented by Anurag Sahay in 2021.
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