The amazing 2-in-1 combo maborun is equipped with 2 standard-size maboruns that combine into a single exciting mega-track, featuring the best tracks and obstacles from the series, including the twin stair conveyor belt, and the marble catapult, both of which give the marbles the energy and velocity to make it through a huge run filled with twists, turns, drops, and traps! This amazing play set comes with its own tracks and obstacles, but each is fully interchangeable with all other standard-size maborun sets, so that you can combine, link, and customize your very own runs, and learn about and observe mechanical and dynamic sciences with your friends and family. This particular run features trap doors, buffer zones to slow the marble, a funnel slide, a vortex track, an s-wave track section, and two transparent gear boxes that let you observe the mechanical functioning of the aforementioned stairs and catapult that power the run! easy assembly and simple parts with lucid instructions will allow your child to build confidence and independence as they construct their own exciting marble run!