The MaBoRun Amazing Stair Climber is equipped with a twin stair that takes the balls down a track set up with a series of traps. The momentum is stop and go, and the fun is in the latter. Send the marble from the conveyor up the twin steps, to the interesting traps, then down to either the buffer zone or the storing dipper, which feed back into the marble conveyor for endless fun. Each MaBoRun play set comes with its own unique tracks and obstacles, and each Amazing set is fully interchangeable with the other Amazing sets, so you can combine, link and customize your very own runs. Play while learning mechanical and dynamic sciences with your friends and family. Colors may vary. Requires 1 AAA battery, not included.