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A two-layer custom modification of the Square-1
Remove the middle layer of a Square-1 and what do you get? A Square-1-II, first created by Anthony Greenhill.
Not all of the pieces can twist - four of the pieces on one layer are permanently bonded, but it's still a fun puzzle.
Thank you to the following people for their assistance in helping collect the information on this page: Joshua Bell.
This puzzle can be found in collections of these members:
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