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

2x2x2x2 (4D)The 4D version of a 2x2x2, implemented with two cubes and magnets.
Airlock 20The simplest possible edge turning dodecahedron implemented in an extremely strange mechanism.
Airlock 6The simplest possible edge turning cube implemented in an extremely strange mechanism.

ArleminxA hybrid puzzles which combines two seemingly incompatible puzzles.
Arrow PlanetA fudged puzzles which combines the moves of a bandaged 3x3x3 and a sliding piece puzzle.
Atomic Chaos (aka Kaos, aka Brain Drain)Scramble the beads from tubes of different lengths, then try to restore them to their proper homes.

Big ChopThe holy grail of twisty puzzles. A 120-piece twisty puzzle which still has to find a good implementation.
Brain-chekA puzzle with a unique mechanism that came in at least four different versions.
Capella CubeTop and bottom layer of a hexagonal prism. Middle layer of a 3x3x3.

Complex 3x3x3An implementation of a 8-years-old dream. A 3x3x3 with six additional pieces types known before only through geometry.
Compound CrystalA non-shape-shifting puzzle with a highly unusual axis system.
Concentric CubeThree 2x2x2's in one puzzle. Some of their corners are fused to each other.

Das TwistJust seven pieces with a strange way of moving.
Das Twist 3DThe 3D-successor of the puzzle with the same name (without 3D obviously)
Dual CircleDual Circle - surprisingly enough is two interlocking circles - pieces move when the circles are turned.

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