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Six-Sided: Cuboid
Domino (USSR)Another Domino from the former soviet union with differently designed numbers.
Domino RevengeA 2x3x4 with the look of a Domino.
Domino SquareA Square-1 twisted into a pattern and afterwards reshaped into a cuboid.

Domino Wind TowerA "windmilled" 2x2x3.
Double Offset 3x4x4A 3x4x4 with the puzzles center placed off-center in two dimensions.
Edges Only 2x3x3 A 2x3x3 without corner pieces

Fish CubePieces of a rhombiminx used to create a 2x2x2 with four additional layers.
Fisher 1x2x2A fishered 1x2x2.
Fisher 3x3x4A "fishered" 3x3x4.

Fisher 3x3x5 CuboidA cubic 3x3x5 twisted inside its solid by 45°.
Fisher Cube IIAn extensions only Fisher Cube.
Fisher Tower (Fisher 3x3x5)A "fishered" 3x3x5.

Flim-Flam CubeA disguised 2x2x4 which pretends to be something more complicated.
Floppy 2x2x3A twisty puzzle with corners that hang in the air.
Floppy 2x3x3A twisty puzzle with corners that hang in the air.

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