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The tetrahedral cousin of the Royal Skewb but invented earlier.
The Halpern-Meier-Tetrahedron is the tetrahedral transformation of the skewb. Analoguous to the Royal tetrahedron is a transformation of the Royal Skewb, a corner turning hexahedron with 4 cuts per throughgoing axis. This was the first puzzle with this kind of axis system and number of cuts. The Royal skewb (in hexahedral shape) was first published 2 years later.
The puzzle has the shape of a Reuleaux tetrahedron. This reduces the size of the puzzle drastically.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
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