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8 billiard balls in a square container. The balls can rotate around the perimeter, or move across the center along one axis.
One of three puzzles named "Diamond Bob". All three use marbles looking like Billiard balls in a transparent body. This one came with a plug (see image 2) to prevent the puzzle from getting involuntarily scrambled.
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Thank you to the following people for their assistance in helping collect the information on this page: Joshua Bell.
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