Mini Coral

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Mini Coral Example.png Mini Coral Example Solution.png

Shade exactly two cells in each 2×2 region, so that all shaded cells are connected, all unshaded cells are connected to the border of the grid and no 2×2 square (regardless of region borders) is completely shaded. Cells with numbers cannot be shaded. The numbers indicate over how many of the original 2×2 regions the respective group of unshaded cells extends. Unshaded groups may contain none, one or several numbers.

(Rules and example from WPC 2019 IB)

History of the puzzle[edit]

Invented by Bernhard Seckinger (Germany) in 2011. First appeared on LMD portal.

Appearances in the past WPCs[edit]