a.k.a. Crazy Tetrahedron Plus
Purchased from Mefferts, 2011.
(plastic, 3.75 inches)
In the same spirit as the generalization of
Rubik's Cube 3x3x3
Crazy Cube 3x3x3,
this is a generalization of
Shown above is Meffert's "regular" version that has no restrictions on moves;
each face can rotate around the circular portion in its center.
Like the Crazy Cube 3x3x3,
Meffert's also has produced different move restriction variations,
with names of the planets
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune).