Offset HexAn offset version of Minimal Hex that makes six triangles disappear.
Offset OctaA puzzle related to Minimal Octa reimplementing Star Trap in a minimalistic way.
Oh CubeA puzzle looking like a 3x3x3 but it is indeed a corner turning hexahedron.
Opposition CubeA 3x3x3 designed from scratch. It is related to the Constrained Cube.
OrganolabacusAn extremely big variant of Astrolabacus with eighteen segments but with six channels of beads.
Oskar's Danger CubeAn extension of the Caution Cube or Geared Mixup concepts - this time with more types of moves possible.
Over-and-UnderThree rings with seventeen marbles each, unconnected but exchangeable.
Panex DuoA doubled version of the classic Panex with five columns and an empty one.
Panex GalaxyA redesigned version of the classic Panex with three columns and an empty one.
Panex JuniorA simplified version of the original Panex with two columns.
PantaBramA puzzle succeeding the PantaCube. It is a Cubedron where not all moves are possible.
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