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

Flower MegaminxA straightforward shape variant of the megaminx with spherical cuts.
Fluvian Scout ShipAn Otter Cube with the shape of a Tetrakis Tetrahedron an painted with an Ufo-based scheme.
Four DigitsSeven pieces plus a gap form the digits 1-4. Unlike other varikon-like puzzles the pieces can be rotated.

Four-pointed starA star-like shape out of five tetrahedra with a hybrid axis system.
Fractal 2x2x2A 2x2x2 in a 2x2x2 in a 2x2x2.
Fractured Prism PlusA pentagonal prism that allows some 90 turns on the five sides.

Fruit Cube - OrangeA 3x3x3 in shape of an orange. One of four fruit-like puzzles.
Fruit Cube - PeachA 3x3x3 in shape of a peach. One of four fruit-like shapes.
Fruit Cube - PearA 3x3x3 in shape of a pear. One of four fruit-like shapes.

FTO TetrahedronA face turning octahedron reoriented and transformed into the shape of a tetrahedron
Fully Functional Siamese DominoTwo 2x3x3's fused into one puzzle with an exciting turns that allows exchanging of pieces between both halves.
Fuse Mirror ArmchairOne half of a Fused Cube implemented with a Bump Cube and an inverted block.

Fused Horror CubeThe Horror Cube combined with the Fused Cube.
Fused Illusion CubeA pair of Fused 3x3x3 but with one cube modified to make it appear like a 2x2x2.
Fused MastermorphixA Mastermorphix bandaged like a Fused Cube.

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