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Offset Skewb 2x2x2
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A hybrid puzzle of Okamoto's offset skewb and a halfturns only 2x2x2.

This puzzle was thought up by Andreas Nortmann, designed by Tom van der Zanden and printed by shapeways. It is a combination of the Offset Skewb (from Katsuhiko Okamoto) and a 2x2x2. To keep it a doctrinaire puzzle the movements of the 2x2x2-part allow only halfturns.
It represents a fully movable tetrahedron: The geometry of a tetrahedron allows only three axis systems for non-shape-changing twisty puzzles:
1. Cuts parallel to face (e.g. Pyraminx) equivalent to corner turning hexahedra.
2. Cuts parallel to edges (e.g. Pyramorphix) equivalent to face turning hexahedra. To stay in shape the movements here have to be restricted to halfturns.
3. A fusion of both cutting sets.

This puzzle here represents this third group but it was given a hexahedral shape. Interestingly this configuration of axes is the only subgroup of traditional axes configuration that is not trivial (only one axis), not a prism and no cuboid.
Edge length: 57 mm
Weight: 65 grams

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