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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.
Thank you to the following people for their assistance in helping collect the information on this page: Anthony Greenhill.
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