NuribouA customly stickered 3x3x3 based on the number game of the same name.
O2 CubeThe slice cube implemented in something that does not look like a puzzle.
OasisCelebrating the britpop band that dissolved in 2009
OctadotA curved cut version of Trajber's Octahedron.
Octagon vs CubeCross between Rubik's Cube and an Octagon. Can be made easily by exchanging pieces between a cube and an octagon.
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