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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.
If you're looking to buy, eBay is the one place you can find almost anything... if you're willing to wait for it, then pay the price!
Thank you to the following people for their assistance in helping collect the information on this page: Joshua Bell. If you have any information or images that you would like to contribute to this entry, please click the apropriate add () or edit () icon above, or use the following links to modify this item, add a recent sale price or to add a new link.