Dive into the world of creative play with a marble ball run race on a handmade course featuring ... From the soothing notes of the xylophone to the clinks of metal, this unique setup offers ...

GraviTrax instead lets users create sprawling marble runs that send metal balls racing across elevated ... for the first time, can run forever—or at least as long as batteries hold up.

Marble run toys typically rely on just gravity to send a marble careening through a complex maze of obstacles, but the creator of Marblelous thinks they can be improved through technology.