It’s a wet and wild marble ride that’s sure to blow traditional marble runs—and science toys for kids—out of the water. From vertical drops and a vortex to spinners and spouts, kids can get their feet wet in the basic principles of physics. Buoyant marbles keep the wonder afloat and a waterproof play mat makes cleanup a breeze. When it comes to engineering toys and building sets, marble runs simply can’t be beat.