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RotoCrystal is an 18 sided analog of the Fracture-10 puzzle, based on the hexagonal dipyramid.
RotoCrystal is an 18 sided crystal shape derived from the hexagonal dipyramid. RotoCrystal has 6 axes of rotation, one at each square face of the puzzle. The axes can turn in 90 degree increments, but only when they will not block adjacent axes. In this case only 180 degree turns can be used. These restrictions can make the puzzle quite difficult, in a similar manner to the Fracture-10 and Fracture-6 puzzles.
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Thank you to the following people for their assistance in helping collect the information on this page: David Pitcher, Andreas Nortmann, Lawrence Cuthbert.
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