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 Dual 3x3x3 II Above:Solved Click a thumbnail to see its larger version and description. A 3x3x3 plus two pieces known from the Complex 3x3x3. Inventor: Sam Jiang Mechanism: 3x3x3 Patents: Unknown Producer: Customly 3D-printed Year: 2020 Original Price: \$0.00 USD Current Price: No Data The inventor conceived this puzzle ever since the Matryoshka Cube, see the separate entry. Essentially, it is two nested 3x3x3s. When the outer 3x3x3 is turned, two corresponding layers are turned on the inner puzzle. The main difficulty of this puzzle is degrees of freedom. On a normal 3x3, imagine turning a top layer and a bottom layer by 90°. Compare this movement to turning a mid-slice by 90°. Both turns will end up with the same end result. On this puzzle, this is not the case - because an outer layer turn will turn 2 inner layers at once, how will the inner cube behave if you try to make a slice turn? The answer cannot be resolved, so thus it must be made so that opposite layers cannot be turned simultaneously (e.g., slice turns are disallowed). This is a somewhat difficult proposition, and the original concepts involved a plunger + magnet mechanism that was overly complex, barely playable and probably wouldn't have worked anyways. Therefore the designer settled on the compromise of the Matryoshka cube. One can't make slice turns if each axis only has one turnable layer. Later he came across an incredibly simple and elegant solution: gravity pins.The result is an extremely simple and elegant mechanism that easily communicates the concept of the puzzle without weird abstractions like circles. This iteration does have one issue (it is technically possible to cheat by initiating a turn, flipping the puzzle over and turning the opposite face) but this is simply because the gravity pins on the outer layer edges are separate on each side instead of being one pin that extends through the piece. This is easily remedied simply by making it one pin going through the edge instead of one pin on each side.Mathematically, this puzzle is a subset of the Complex 3x3x3. It includes two new piece types: the "inverted 3x3x3 edges" and the "inverse 3x3x3 core". The "inner 3x3x3 centers" are visible, but without super stickers scheme on this puzzle they are irrelevant to the solve. Links Contributors No one has contributed to this page yet! Collections This puzzle can be found in collections of these members:ROBERTO1970: RnD CollectionFound a mistake or something missing? Edit it yourself or contact the moderator. join »login » Community Members: 4998 Most recent: PuzzlingTime Members online: and 1 hidden, as well as 1 guests and 0 web crawlers. Topics/posts: 35939/404878 Some recent posts: Re: The OsCube by Ilya Osipov by calvinfan 6 hours ago. Re: grigorusha Etsy store !!!!! by wwwmwww 10 hours ago. WTB or exchange some more puzzles by rubikland 10 hours ago. Re: Jumbling in Overlapping Disk Puzzles by benpuzzles 12 hours ago. Re: Jumbling in Overlapping Disk Puzzles by benpuzzles 12 hours ago. Thanks for spending your time with us Frank and Darren. You are missed.