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

Calvin's Puzzle
Calvins Cuboid Series (L-Cube)A 3x3x3 with two sides extended with an additional rotating layer. Member of a whole series similar to the Crazy Plus 3x3x3s.
Calvins Cuboid Series (T-Cube)A 3x3x3 with three sides extended with an additional rotating layer. Member of a whole series similar to the Crazy Plus 3x3x3s.
Calvins Cuboid Series (Temple Cube)A 3x3x3 with five sides extended with an additional rotating layer. Member of a whole series similar to the Crazy Plus 3x3x3s.

Calvins Cuboid Series (Trio Cube)A 3x3x3 with three sides extended with an additional rotating layer. Member of a whole series similar to the Crazy Plus 3x3x3s.
Chinese Zodiac Animal 2x2x2 Puzzle HeadA series of twelve animal heads modelled an 3D-printed around an Eastsheen 2x2x2.
Circle MinxThe fist application of the circle-concept to a megaminx.

Constrained CubeA 3x3x3 which twisting abilities can be contrained by various pieces. Mass produced versions of seven variants exists.
Corner-Road Bandage CubeA variant of the Latch Cube. Latches are placed on four corner pieces.
CrazyBad 4x4x5 Cuboid (center-shifted)A 4x4x6 with one layer eliminated.

Cross CubeA 5x5x5 without corners, wings and edges. The X- and T-faces are distinguishable.
Crossroad Cube (or Latch IV Cube)A variant of the Latch Cube. It reimplements the traditional bandaged cubes.
Cube 3-compoundA hybrid puzzle which combines two axis systems and has a perfectly fitting shape.

Cube HouseA beautifully stickered piece shuffle transformation.
Cutter CubeThe concept of the Wall cube implemented with a 3x3x3
DinomorphixA tetrahedral version of the Dino Cube


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