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Other Puzzles: Siamese & Fused
Cubie Chaos 2A small number of Eastsheen 2x2x2s joined and extended to form a 3x4x4 block which poses a new kind of challenge.
Cubie MadnessFour 2x2x2s extended to look like a 3x3x4.
Diabolo (Mini Inverted BiCone)Two Conical 3x3x3's fused together at their tips => Siamese Cones.

Double 2x2x2 CubeOne cube shared
Dumbbell CubeTwo 3x3x3s connected with a complex mechanism. Every turned side is followed by one side of the other cube.
Dumbbell SkewbTwo Skewbs (or better: Holey Skewbs) connected with a complex mechanism. Every turn is followed by one turn of the other Skewb.

Evil 2x3x4A wannabe 2x3x4 made from two 2x2x2s.
Evil mask cubeA fused cube, extended to become a 4x4 evil twins cube. After that it was shaped and stickered to look like the 4x4 mask cube.
Evil TwinA Fused 2x2x2 with additional cubies.

Evil Twin 4x4x4A Fused Cube with additional cubies glued on to create the illusion of a 4x4x4
Evil Twin Master FloppyTwo Floppy Cubes fused to look like 1x4x4.
Fortress CubeA fused puzzle which combines two different puzzles.

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.
Fully Functional Fused 2x3x3A Siamese 2x3x3 which allows additional unexpected moves.

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