Added from Cubicdissection: In Brackets and Edge Corner Cube II,
and from CMC-Puzzles:
Puzzle number 500: Kugellager
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This puzzle completes the first 500 of my collection and is well suited for this: Unbelievable
1250 moves to remove the first and only piece, in some way similar to the Tern Key, The Brain
or Chinese Rings puzzles, like Spin Out. Very fascinating, but it takes some time to solve .... quite
some time, indeed.