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A puzzle with moving marbles which reminds one of the Astrolabacus.
This puzzle was known as Chainball for some time. It consists of 20 marbles. 5 marbles for each of the four colors. Depending on how the two spheres are rotated the puzzle allows two different movements:
1. If the rotating gears are orientated parallel there are two layers with 10 marbles each. Each layers represents a circular movement of the marbles.
2. If the gears are not parallel a single circular movement for all 20 marbles is possible.
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