Lighthouses

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Rules[edit]

Lighthouses Example.png Lighthouses Example Solution.png

Locate ships in the grid such that each “lighthouse” (clue with a given number) indicates the number of ships in the same row or column as that lighthouse (it “sees through” other lighthouses and other ships). Each ship occupies a single cell and does not touch other ships or lighthouses, not even diagonally.

(Rules and example from PGP IB)

History of the puzzle[edit]

Probably first appeared on WPC 1993. The author of the puzzle is unknown.

Appearances in the past WPCs[edit]