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A crossword based on a model of a catenoid. Effectively, when flattened, the puzzle is equivalent to a grid of squares which have been cut in half diagonally in alternate directions, with words reading in the rows and columns. You could think of it each square having two letters, but the squares alternate as to whether the letters are read in the same order both directions, or in opposite orders.
MIT Mystery Hunt 2020 Catenoid