Quadrilla is a unique type of marble run. Made from lightweight wood, it is easy to build with and very stable. Use the various colored blocks to elevate your railed wooden track. Marbles zoom along the rails, picking up speed in the various connector blocks that take the marbles from one level to the one just below. Then Swoosh! The marbles enter a spiral vortex, where they circle around and drop out the bottom. Set up Quadrilla in many different configurations, and watch as your marbles spin and roll to the finish line!