Circus PuzzleA combination of the shapes of Hexagonal dipyramid and Twister cube.
Coffin SkewbA skewb transformed comparable to a Mental block but this time resulting in a coffin-like shape.
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.
Conjoined CubesTwo 2x2x2s fused into one puzzle. They can be played both but not simultanously.
Coral CubeDesigned to be the Ghost Kilominx Cube - Hollowed Edition but named differently.
CoreA Rex Cube in shape of three intersecting cylinders.
Core CubeA 5x5x5 with a shape akin the Cross Cube but still equivalent to the original puzzle.