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Other Shapes: Other
X-Cube (Crossoid)A 3x3x3 with additional layers on four of its sides.
X-Cube (Star Wars)A merchandising version of Playtypus with a StarWars-theme.
X-Cube 2The smaller cousin of the Crossoid.

X2 X-CubeA 3x3x3 with two additional layers on four of its sides.
Yego's Double TwistA 3x3x3 transformation into a two layer twister.
YouCubeThis puzzle tries to answer the question "How strange can a puzzle look like?"

ZicronaminxA hexagonal prims which is three layers high and two layers thick.

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