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A crossword variant in which words may meander around the grid on orthogonally connected paths. Conventionally, each square is used in exactly two entries. The Pipe Dream crossword is a variation on this where additionally each edge between squares is crossword once, and the words can be colored red and black so each letter is part of one red and one black word.
MIT Mystery Hunt 2002 The Path of the Argo
MIT Mystery Hunt 2006 Pipe Dream
MIT Mystery Hunt 2011 Pipe Dream 2: Rapid Transit