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Six-Sided: Cube (Shape Preserving)
Dual 3x3x3Two 3x3x3s in one puzzle with some sides of both parts connected. Five different versions were produced.
Edgeless 4x4x4A 4x4x4 without edges.
Edges Only CubeA 3x3x3 with the corners made invisible.

Edges Only Void CubeA Void Cube with hidden corners.
Elite skewbThe first corner-turning hexahedron with 3 cuts per axis.
Escher SkewbSkewb featuring original artwork by M.C.Escher, shows a total of 12 fish.

Evgeniy Pillow DinoA new design of the Dino Cube which comes in a variety of colors.
Eye SkewbA puzzle with 4 axis and many ways to interpret it.
F-SkewbF-Skewb = Offset Skewb + 4 Dino cuts

Fadi CubeA twisty puzzle cube that turns around its corners. It has five layers per throughgoing axes.
Flower CopterA hybrid puzzle which combines the moves of the Curvy Copter (hence the name) and moves similar (but not identical) to the Rex Cube.
Flower Copter IIA successor of the Flower Copter with different cuts.

Gear Ball In A CubeA mass produced Gear Cube truncated into a sphere. The corner pieces were subsequently replaced with pieces giving the puzzle the look of a 2x2x2 with holes.
Geared 1x1x4A 1x1x4 which poses a real challenge to the user. All four pieces are connected to each other with gearing system which make the puzzle similar to the enigma.
Geared Redi CubeA puzzle which looks like a Redi Cube but uses gears to force a synchronized move.

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