Outlander-60A modification of Outlander 2D-2, unbandaged and with two possible ghost axes.
Outta GasA 3x4 slide puzzle with an elaborate outfit and twelve challenges.
Oval SnakeA Rubik's Snake with unusual oval pieces.
Over-and-UnderThree rings with seventeen marbles each, unconnected but exchangeable.
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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