CodebreakerA moving hole puzzle where you can can twist the 4 corner tiles all at once.
CodexA skewb in the shape of a cuboctahedron with a custom painting with 24 faces.
Coffin SkewbA skewb transformed comparable to a Mental block but this time resulting in a coffin-like shape.
Cognos CubeA cube advertising a software company which later became part of IBM.
Cohan CircleTwo intersecting circles. There exists a newer relative named Arusloky.
Coin Chest PuzzleModified version of Treasure Chest to allow coins be placed into it. One face was replaced and two corners were cut into.
Coin CubeA very simple hybrid puzzle but interestingly not the simplest.
Coin IcosahedronAn icosahedron that combines face and corner turns into a hybrid axis system in the easiest possible configuration.
Coin SkewbA cube with hybrid axis systems combining a Skewb with an extremely low cut face turning cube.
Coin TRDThe simplest possible face and corner turning Trapezo-Rhombic Dodecahedron.
Coin TransformerA rhombic dodecahedron with four sets of cuts that combine the Coin TRD, the Coin Rhombic Dodecahedron and the Rhomdo Transformer.
Coke CubeA can of coke converted into a 3x3x3 cube.
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Coffin 2x2x3
Coin Octahedron
Coin Rhombic Dodecahedron