OrchidA puzzle with multiple origins, nineteen different moves in three different sets.
OrganolabacusAn extremely big variant of Astrolabacus with eighteen segments but with six channels of beads.
OrionA puzzle with 25 circles and 60 pieces.
Orion (Mako)Six intersecting circles rotatable in steps of 120°
Orion-14Four intersecting circles (in steps of 90°) in a 2D-puzzle of soviet origin.
Orlov TwoTwo circles and irregular center pieces.
Orlov fourThe successor of the Orlov with four gears, even with the same middle pieces.
Orlov gearInspired by the gear puzzles from Douglas Engel. Three circles and irregular center pieces.
Ornamental SkewbA Skewb transformed into a Super Skewb by gluing "rooftops" onto the square pieces and stickering them apropriately.
OrpheusA hybrid of 2x2x2 and DeCETH.
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