Online since 2002. The most comprehensive site for all around twisty puzzles.

ChronosA puzzle which is based on the fourth dimensional symmetry (edge-transitivity) of the 4D polytope 5-cell (also known as Pentachoron)
Circle 1x2x3A 1x2x3 with circles in the small faces. This doesn't change the puzzle but looks fascinating.
Circle MinxThe fist application of the circle-concept to a megaminx.

Circle Pentagonal PrismA three-layered pentagonal prism with circles in the top and bottom face.
Circo-Radiolarian (Radiolarian 2)The first face turning icosahedron with planar cuts.
Closed Path CubeA variant of the 3x3x3-mazes but this time with differently orientated lines.

Colors Inside CubeA 3x3x3 stickered in an innovative way.
Colossal Master MagicA custom made Rubiks Magic with 32 tiles. Also known as "bat squad"
ColossusA puzzle which is based on the fourth dimensional symmetry (edge-transitivity) of the 4D polytope 24-cell (also known as Icositetrachoron).

ComboCopterA hybrid puzzle which combines a 2x2x2 with a Curvy Copter.
ComboctahedronA hybrid puzzle. It looks like the face turning octahedron and the magic octahedron but allows the moves from both puzzles.
Compy SkewbA corner turning hexahedron with four (no more!) logical layers.

Concept 11 - DaYan Gem IIIA hybrid puzzle in the most appropriate shape of a truncated octahedron.
Constrained CubeA 3x3x3 which twisting abilities can be contrained by various pieces. Mass produced versions of seven variants exists.
Corner Truncated 3x3x3 Extended 000A 3x3x3 truncated on one corner and extended on three sides. The result is a pyramid with a triangular base.

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