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A 3x3x3 with an additional layer glued on. In shape of a mushroom.
The inventor created several differently stickered variants of this concepts. All have in common that they seem to be 3x3x4 but are 3x3x3 with an additional layer glued on. In this case the lowest layer consists of extensions glued onto the one above that.
The year given here is an upper bound.
This puzzle was shown in "The book of ingenious an diabolical puzzles" from 1994.
It was shown in an image from James Dalgetys collection no later than 1990.
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