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

Other Puzzles: Siamese & Fused
Floppy Siamese Fisher 1x3x3A Siamese puzzle made of two Floppy Fishers
Fortress CubeA fused puzzle which combines two different puzzles.
Fortress Cube 2Nine 3x3x3s fused into one puzzle.

Fortress IIEight 3x3x3's connected with one 6x6x6 between them. Since they share only one piece each the nine puzzles can be solved independently.
Fractal CubeA twisty puzzle that is self-similar.
FractalmorphixOne big Pyramorphix with four attached smaller Pyramorphixes.

Fully Functional Fused 2x3x3A Siamese 2x3x3 which allows additional unexpected moves.
Fully Functional Siamese 2x2x2 Helicopter CubeTwo hybrid puzzles combined in a fully functional Siamese.
Fully functional Siamese 2x2x2The first Siamese puzzle that can intermingle pieces between the parts.

Fully functional Siamese 3x3x3It looks like a pair of Siamese Cubes but it allows to exchange pieces between the halves.
Fused 2x2x2Two 2x2x2s fused with one common cubie.
Fused 3x3x3 Octagonal BarrelA Fused Cube implemented with two octagonal prisms.

Fused 3x4A Fused 3x3x3 and a Fused 4x4x4 in one puzzle.
Fused 4x4x4This is a fused 4x4x4 made from two Revenge cubes.
Fused 5+7A 5x5x5 and a 7x7x7 fused into the same puzzle.


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