Pocket Quatrium Puzzle (2-circle, 3D printing Mod)
This is a 3D printed rotating puzzle designed by Mr. Xu and Li. It consists of 2 circles, and the pieces within can move freely to other areas inside the frame. Mix up the pieces and then challenge your logic to get the two circles back to their original design.
Part of a the pocket series, which is perfect entertainment you can take with you wherever you go.