X-Cube HybridThe X-Cube from Calvins Cuboid series with circles on two sides.
X-DinoA shape variant of the Dino cube resembling the X-Cube
X-MegaminxThe concept of the X-Cube applied to a megaminx.
X-Men 3x3x3A 3x3x3 painted with six characters from the X-Men comics.
X-MinxThe concept of the X-Cube applied on a megaminx.
X-RexA Rex Cube truncated on all edges. Inspired by the X-Cube but implemented differently.
X-SkewbA face turning octahedron transformed into a cuboidal shape. A shape changing puzzle.
X-Tra Alarm ClockA alarm clock looking like the Rubiks. It is not a puzzle because only one side can be moved to swith between the modes.
X2 X-CubeA 3x3x3 with two additional layers on four of its sides.
XIThe "original" design of Rubik's XV. It has three intersecting plungers and 11 tiles.
XL-25A variant of Lights Out probably predating the other known variants.
XO CubeA Dino Cube with a cage as visible core.
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X-Cube Barrel
X-Square-1
X/Y bandage Square-0