Statistics say this is the 500th post. What better way to mark it than this delectable construction?
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 size of the island. Each island also pairs up with one other island - the islands within a pair are connected through a corner. Such connections are exclusive - islands from any of the pairs never touch a third island outside the pair.
About: Binary Island Systems was invented by Anurag Sahay in 2021 and debuts today.
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