CrunchLabs by Mark Rober The Crunchinator
A hand-cranked crusher that shows how gears multiply force
Design glittery marble runs and test drops, twists and races.
Best for kids who like designing tracks and fixing what goes wrong.
Paid link: Electroys may earn a commission at no extra cost to you. Listing verified October 28, 2026.
A 2026 marble-run set with 65 glittery track pieces and 10 marbles. Kids design layouts with drops and twisting paths, test them, and adjust when a marble stalls or flies off, with a learning guide covering the physics.
Always follow the manufacturer’s age and safety guidance. Small parts may be a choking hazard for children under 3.
A hand-cranked crusher that shows how gears multiply force
Build a giant wearable robot hand powered by water pressure
Chunky magnetic bars and balls that show attract and repel
Build a motorized race car with a V8, gearbox and suspension