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

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Fractured TetrahedronA "fracture sliced" triakis tetrahedron, with four axes of rotation.
Framed CubeA 4x4x4 reduced to the maximum! The inner 2x2x2 is visible and has to be solved too.
Frucht TwistA twisty puzzle without any symmetry and based on a very strange graph.

FudballThe dodecahedral cousin of the Doctor Skewb.
FudgedronA fudged cousin of the Gem III. A hybrid of corner turning and face turning hexahedron which allows 60-turns on the corners.
FudgidronA face turning chamfered cube. A fudged puzzle.

Full Turn CubeThis is a 3x3x3 which allows only 360 turnes. It is a puzzle that isn't.
Fully functional Siamese 2x2x2The first Siamese puzzle that can intermingle pieces between the parts.
Fun BlockFun Block is a multi-origin puzzle with five axes of rotation. It can be viewed as shape variant of the Fully Functional Siamese 2x2x2.

FuttminxThe "fudged" cousin of the tuttminx which allows more movements.
GallaTrapAnother face turning tetragonal trapezohedron with an alternate sweet spot.
Gear and SlideThis puzzles combines gearing and sliding. One of its moves reminds one of the Minimal Twist.

Gear Bracelet 7+5Eight Gears of different sizes on a foldable band.
Gear Bracelet Double RowSixteen gears placed on a bracelet, grouped in sets of four.
Gear Cube IIAn enhanced version of the Gear Cube with gears in the corners and more types of moves.

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