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For PocketPC 2002 and later.
A free version
Also available for SmartPhone
The most challenging puzzle since the Rubik's Cube was invented :)
Each ring can rotate. You need to bring the numbered chips in order.
There are 12! = 479,001,600 possible permutations.
Unregistered game always starts with the same permutation.If for any reason you can not use PayPal,
you can try PocketGear or Handango PS: There is a spoiler available for those who give up ;)
and many more puzzles!