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Extended version of the normal Crystal 3x3x3.
36 cubelets on a normal cube. Yes, there is a full 3x3x3 in there.
"C4" is a reference indicated in Part 2 of CFF25 (silver edition).
Weight: 108 grams
The year given here is an upper bound. This puzzle was shown in "The book of ingenious an diabolical puzzles" from 1994.
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Thank you to the following people for their assistance in helping collect the information on this page: Anthony Greenhill.
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