Jelle Bakker, who has a fondness for complex marble runs, made this epic 750-feet long sand track that descends some 125 feet from its start to its finish. The 12 marbles competing in this video take ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Burt Helm A great marble run, like any good learning toy, sparks curiosity and ...

Which marble run is best? Marble runs are rolling ball sculptures you build yourself. You assemble tracks in all kinds of wild configurations and watch as the marbles roll down hills, around corners ...