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Twisty Burr
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A puzzle consisting of an inner 2x2x2 puzzle, and an outer shell burr puzzle.

The inner 2x2x2 is only solved when the outer shell pieces fit around it.

The puzzle is made more challenging since the shell pieces have two solutions, and both can also be done inside-out. However, the inner 2x2x2 can only be solved for one of these.



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Professor Pyraminx

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