Complex SkewbA Master Skewb hidden inside a Skewb with many holes.
Compound-2-BallsA 3x3x3 which looks as if two spheres were fused into one solid.
CompraminxA corner turning truncated Triangular dipyramid.
Compy Skewb IIA corner turning cube that combines the turns of a skewb with four compy turns.
Cone 1x2x3A 1x2x3 with an additional piece printed in-place on a FDM-printer to resemble the shape of a cone.
Copter ExtremeThe Clover Cube Extreme with different cuts exposing an additional type of piece.
Copter TowerA 3x3x3 with curvy cuts, fishered and elongated on one axes.
Cracked 1x2x3A non-bandaged Square-1 with eight segments on top and bottom. In shape of a cuboid.