Get ready for a whole new way of playing with K'Nex with the K'Nex Marble Run With Motor! This set includes 3 design templates with easy-to-assemble parts for a fun building experience! Put one together, then take it apart to build another. Or be creative and design your own course! Watch your marble race around the track with 4 different paths. Where will your marble end up? This set contains over 350 K'Nex parts to assemble your marble masterpiece. Use the engine for maximum mechanical fun!