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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.
Forty-Three PuzzleA variant of the 15 puzzle made of three 15 puzzle fused into one.

Four Colour Six Spot CubeFour colour sticker variant of the Six Spot Cube creates a cubic equivalent of the Ivox
Four Colour Super Six Spot CubeFour colour sticker variant of the Six Spot Cube creates a cubic equivalent of the Tetraminx
Four DigitsSeven pieces plus a gap form the digits 1-4. Unlike other varikon-like puzzles the pieces can be rotated.

Four Layer ThingAn Ufo with two additional layers.
Four Sides Extended 3x3x3A shape variant of the 3x3x3. Four rows of three cubies each were glued onto a 3x3x3.
Four Sides Extended OctagonA shape variant of the 3x3x3. Four rows of three cubies each were glued onto an octagonal prism.

Four-Colour ArrowminxA megaminx customly painted with four colours and two black lines per side.
Four-Colour CubeA sticker pattern inspired by the four-colour-theorem.
Four-colour stickerless 4x4x4 cube4x4x4 stickerless cube where every layer has its own colour.

Four-sided Pyramid (Octagonal Edges E8000140294 Extended)A 3x3x3 truncated on five edges and afterwards extended. The result has the shape of a pyramid with a four sided base.
Fractal FlakesSix intersecting circles, five small ones in steps of four, one in steps of five.
Fracture-10A fully custom ten-sided puzzle with five axes of rotation.


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