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making it a harder solve
For example
It is a corner turning puzzle with an 8 axis core
This adds an extra element of difficulty to the solving
Calvin's Puzzles Constrained 90 Color:Stickerless making it a harder solveThis puzzle has a specially designed mechanism that allows each face of the cube to turn only 90 degrees to one side. It is the hardest to solve in the series of constrained cubes.
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