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3x3x3
Forest of WanderA Bump Cube (aka Mirror Blocks) bandaged like a Mefferts Bandaged Cube and colored differently but still in a single color.
Fortress Cube 2Nine 3x3x3s fused into one puzzle.
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 CubeA sticker pattern inspired by the four-colour-theorem.
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.

Fourcone 3x3x3Four cones joined in one solid.
Fourcylinder 3x3x3A curved version of the deltoidal icositetrahedron outside of a 3x3x3.
Fourcylinder 3x3x3 V2Four cylinders joined in one solid. This time by extensions not truncations.

Fractured Rainbow 3x3x3A 3x3x3 truncated on all eight corners in a strange but symmetric way.

Fragmented CubeA shape transformation of a 3x3x3 that pretends something way more complex is going on.
Frank's DodecahedronA 3x3x3 in shape of a dodecahedron but orientated differently.


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