Os CubeA 2x2x2 which uniform tiles retract or extended when the puzzle is turned.
Oskar's Danger CubeAn extension of the Caution Cube or Geared Mixup concepts - this time with more types of moves possible.
Osnik PrismHexagonal prism with three turns per side and two seperate groups.
Other 4x4x4 (aka Puzzle 19)Designed to be a 4x4x4 with exposed new theoretical pieces. Although it has 64 pieces it presents itself as a superset of the 3x3x3.
Otter CubeA split bandaged 1x2x3 offset similarly to the zock cube.
Outlander 2D-1First member of the outlander family, puzzles with intersecting circles based on a rune known from the Outlander movie.
Outlander 2D-180A variation of the Outlander 2D-1 model which has now been made symmetrical.
Outlander 2D-2Second member of the outlander family, puzzles with intersecting circles based on a rune known from the Outlander movie.
Outlander 2D-3Third member of the outlander family, puzzles with intersecting circles based on a rune known from the Outlander movie.
Outlander 2D-3 PlusA small transformation of the Outlander 2D-3. 3 pieces have been added, adding 3 new axes.
Outlander 2D-4Fourth member of the outlander family, puzzles with intersecting circles based on a rune known from the Outlander movie.
Outlander 2D-90A variation of the Outlander 2D-1 model which has now has 4 corners.
Outlander 3DA Unicorn cube in shape of a Reuleaux tetrahedron. It shows four times the rune known from the Outlander movie.
Outlander OctahedronThis is a hybrid, combinging edge turns with very shallow face turning of an octahedron.
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Oskar Geary cube