Diamond Bob's Billiards 9-Ball
Designed by Josh Frankel, copyright Binary Arts 1998, made in China.
(plastic, 3.6 inches diameter by 5/8 inches thick)
The puzzle has a circular track that can hold 9 discs and a track across the center that can hold two additional discs.
The track across the center is actually Y-shaped, but this is just to make the piece fit well.
The basic operations are to rotate the circle of discs, or to move a disc into or out of the center track
(so there are a total of 10 discs and a gap, and at any time the circle has 10 discs and center track 1 disc,
or the circle has 9 discs and the center track 2 discs).
The goal is to mix up the puzzle and then restore it to the solved position where the discs numbered 1 to 9 are in numerical order
around the circle and the white disc is in the center.
presents two different solution methods.
A much easier puzzle in this theme is
Diamond Bob's Billiards.