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

Cubes with interchangable pieces
4CubesFour parts (looking like a 3x3x3) connected into a single puzzle.
Cubes on a DiskTwo 4x4x4 connected with a disk which allows to exchange pieces between the puzzles.
Cuboids on a TorusFour Cuboids connected together on a torus which allows to exchange the pieces between the puzzles.

Fully Functional Siamese DominoTwo 2x3x3's fused into one puzzle with an exciting turns that allows exchanging of pieces between both halves.
HATO PuzzleThe first physically implemented 4D cube.
Seven Star UFO7 spherical 2x2x2s embedded in an UFO-like shape. The pieces can be exchanged.

Swap CubeFive differently colored 2x2x2 embedded in a strange mechanism which allows one to exchange the cubies between the individual cubes.
Triple Fused DominoThree Dominos reduced two two turns fused into one puzzle that allows to exchange pieces.

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