Octahedron AxisA 3x3x3 was transformed into an Axis Cube which was transformed into an octahedron.
OctaphobicAn 8x8x8 Mastermorphix. An 8x8x8 transformed into the shape of a Reuleaux tetrahedron.
OctrignisA mass produced Vulcano with four tips truncated.
Open PetaminxA bandaged Petaminx with a big part of the puzzle removed.
Opposition CubeA 3x3x3 designed from scratch. It is related to the Constrained Cube.
Overlapping 3x3x5A 3x3x4 (which is based on a 3x3x5) is modified like the Overlapping 4x4x4 was made out of a mass produced 4x4x4.
Overlapping Cube VariantA simple Overlapping Cube with an additional set of four edges exposed. This puzzle turns like a cuboid not a cube.
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