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Inspired by CMetrick this puzzle pushes that concept to a new level.
This puzzle was named after Bram Cohen who conceived the idea and presented it to Oskar van Deventer. The puzzle was inspired by CMetrick but it has way more degrees of freedom.
Two oppositely placed ball have to be rotated to perform a move of the puzzle. In which direction these balls are moved can be arbitrarily choosen and the direction of the second ball does NOT depend on the direction for the first ball. The other two balls will always move with the first pair but in unusual ways depending on the combinations of directions for the first pair.
The version shown here is the second one presented in 2011. The first version (of 2009) is identical in terms of functionality butvery different in terms of appearance.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Blake Nors.
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