Column CubeA cornerless 3x3x3 with some cubies glued onto the edges.
Compound FractureCompound Fracture is a new puzzle based on the geometry of the Fracture-10, altered to allow 45 degree turns along 4 axis.
Compound-2-BallsA 3x3x3 which looks as if two spheres were fused into one solid.
Concentric CubeThree 2x2x2's in one puzzle. Some of their corners are fused to each other.
Concussion CubeA shape variant of the extended-only 3x3x5. It inverts the capsule cube.
Core CubeA 5x5x5 with a shape akin the Cross Cube but still equivalent to the original puzzle.
Cornerless CubeA custom made cornerless cube without any remnants of the corner pieces visible.
Crazy 2x2x2A mass produced cross cube built with pieces from the Super 2x2x4.
Crazy CometA jumbling twisty puzzle based on the geometry of a Rhombic Dodecahedron.
Crooked-1A quick sticker variation created this midtwist puzzle.