GearboxFive cog wheels on one axis turned with different step widths every turn.
GearoThree gears of different sizes. At any given time two of them rotate while the third one is blocked.
GearuFour gears in different sizes. They turn in neighboring pairs.
Hex ShiftFourteen gears on a hexagonal shape.
Shift HappensSix unequal gears separable and rotatable in groups of three.
Spherigear LoopEight spherical gears of which four are turned at any time in conjunction. The very rare case of an abelian twistypuzzle.
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