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The Twin Tritangle puzzle is essentially two Tritangle puzzles sharing a single core, There are twelve axes, only six of which are initially available. For the first couple of moves, the puzzle behaves like two separate TriTangles, However, the "stored" axes allow the pieces to interchange between the two TriTangles, provided those axes are not blocked by the large spikes. This makes the Twin TriTangle more challenging to solve than the original TriTangle Puzzle. This beautiful puzzle is stable and turns very smoothly. It comes fully assembled and stickered. Have fun!