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Gear Cube Extreme/Anisotropic Cube
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A Gear Cube with four geared edges replaced with four non-geared edges.

A Gear Cube with four geared edges replaced with four non-geared edges. Oskar designed these edges independently from the Gear Cube to allow replacing the original edges without buying a new puzzle. The non-geared edges allow unconnected quarter turns on two faces, meaning that any gear can change position with any other gear. This makes it much harder than the original Gear Cube and it's probably harder than the original 3x3x3 Rubik's Cube as well. If on non-geared edge is held fixed in space its four moves make up a well defined group. In this case the configuration which side is turnable and which not does not change.

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