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The first 4x4x4 with circles. It exposes the theoretical inner 2x2x2.
This puzzle was first named 4x4x4+2x2x2-Cube which is a fitting name since all pieces from a 4x4x4 are present and the pieces inside the circles behave like they were the pieces of the inner 2x2x2.
This is the first of a series of Crazy 4x4x4's. This variant still has indistinguishable face-pieces like any 4x4x4.
The patent number given here steems from a soviet union patent granted in 1988 to Andrej Sergeev. It is assumed that (re)inventor didn't know about this earliest trace.
Edge length: 67 mm
Weight: 173 grams
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Marco.
This puzzle can be found in collections of these members:
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