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Spaghetti Junction
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Four rings with seventy marbles in total, unconnected but exchangeable.

Spaghetti Junction is named after a crazy category of highway intersections, where several highways and local road meet, and that are connected with many flyovers. The puzzle was inspired by Devin Montes' Chain Puzzle as was the earlier Over-and-under form the same inventor. However, where Devin's puzzle has only a single viaduct, Spaghetti Junction has multiple flyovers, four at each of the two parts.
The puzzle is scrambled by moving the balls and clicking the two halves between their eight states. The two parts are held together with magnets: sixteen 3x3-mm cylinder magnets, one 6 x 13 mm, and one 6 x 6 mm. The balls are 10 mm diameter delrin balls. The lengths of the flyovers are 4, 3, 3, and 2 units for one part, and 3,3,3, and 2 units for the other. In some states of the puzzle ("traffic jam") all balls need to move together in one long line.
There are 70 marbles in 8 colours:
12 yellow
9 red
8 green
6 blue
6 white
8 grey
9 pink
12 orange

In 2023 hknowstore presented it under the name "Over & Under 4-loop Chain Puzzle"
Length: 160 mm
Weight: 138 grams

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