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Three rings with seventeen marbles each, unconnected but exchangeable.

Over-and-Under is a twisty puzzle with moving marbles. The puzzle was inspired by Chain Puzzle from Devin Montes. However, where Devin's puzzle has only a single viaduct, Over-and-Under has two of them. The puzzle is scrambled by moving the balls and clicking the two halves between their six states. The two parts are held together with magnets: twelve 3x3-mm cylinder magnets, and two 5x8-mm. The balls (17 per ring) are 10-mm-diameter delrin balls.



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