Want to challenge your little builder? Hape designed and manufactured the perfect marble run for your construction toy fan - The Challenger Quadrilla 147 pc Wooden Marble Run. Quadrilla building system features high quality wooden marble runs that can be assembled in many ways. Quadrilla marble run building toys are made of heirloom quality birch and rubber wood to last for years of constructive play. This new building set from Educational Toys Planet features 147 parts for unlimited construction. The Challenger Quadrilla 147 pc Wooden Marble Run includes straight and curved rails, high-velocity tunnels, a seesaw, accelerators, blocks, levelers, bases and 50 marbles. It is fun for the kids to follow the building ideas from this set, and design their own marble runs, and definitely fun to watch the marbles go down the rails. Quadrilla Challenger set promotes 3D reasoning, creativity and engineering abilities. As all Hape's toys, this deluxe marble run construction toy complies with all US toy safety regulations.