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Half Turn Tetra
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An edge turning pyraminx which does not change shape.

Half Turn Tetra is an edge turning tetrahedron, suggested by Andreas Nortmann. The edge turning tetrahedra which are known so far are all shape transformations of NxNxN's and therefore still allow 90-turns and chage their shape.
However, the internal mechanism of this puzzle allows only 180-degrees turns. The mechanism is based on the Half Turn Cube. The internals of the corner pieces look like a spiral staircase. This way, shape-changing is prevented.
It implements Gelatinbrain 5.2.3.
Edge length: 113 mm
Weight: 128 grams



Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Lawrence Cuthbert.


This puzzle can be found in collections of these members:

Andreas Nortmann: Andreas' collection

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