With the GraviTrax C extension interaction, the ball track construction for children from 8 years of age is electronic. Send electric stones and receive signals. As soon as a ball rolls through the trigger, a signal is triggered. The player determines whether the switch, dome starter or action stone lever should respond to the signal. With a controller, the course of the sphere can be influenced. The electronic elevator raises balls one level higher automatically and without manual reset. Thus, new energy is gained and a near-infinite orbital adventure can begin.