ForamenCombines two intersecting circles with one plunger.
FordulóA 2x2x2 DIY kit from the original cube craze.
Forest of WanderA Bump Cube (aka Mirror Blocks) bandaged like a Mefferts Bandaged Cube and coloured differently but still in a single colour.
Fortress CubeA fused puzzle which combines two different puzzles.
Fortress IIEight 3x3x3's connected with one 6x6x6 between them. Since they share only one piece each the nine puzzles can be solved independently.
Fortune FloppyA folding puzzle combined with some simple twist moves. It is an amazing combination of mechanisms.
Four BarrelA 2x2x2 with two additional types of turns. A very strange fellow.
Four DigitsSeven pieces plus a gap form the digits 1-4. Unlike other varikon-like puzzles the pieces can be rotated.
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