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Other N-Sided: Four
UltramorphixA 5x5x5 modified into a truly tetrahedral shape.
V7 TetrahedronThe tetrahedral variant of the 7x7x7.
Void PyraminxA Pyraminx with a hole.

Windmill TetraA Windmill Cube transformed into the shape of a tetrahedron.
XenomorphixA tetrahedron made from a 3x3x3. This one was "fishered". Means: Its axis system was twisted by 45° inside its solid.

Xenopix (Sharp Edges 580002000)A 3x3x3 truncated on four edges and afterwards extended. The result has four sides but looks like a pressed tetrahedron.

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