Hapes Robot Factory Domino set includes two double-sided ball tracks, which feature a normal track and a zig-zag track. Use stored potential energy to catapult a wooden ball into the air with this exciting robot-themed domino set! An Ideal perfect wooden toy set for kids that contains a tipper car, crazy ball track, tipper arm and series of ramps form an exciting robot production line that you can build again and again. Play Tips Firstly, start by building one of the configurations shown on the box. Secondly, put a wooden ball in the rail car and release it down the ramp. As the car tips over, the ball is released and starts the domino effect. Watch the momentum wheel turn before the catapult fires another ball into the air, which will send more dominoes tumbling. Momentum flows through the spinning arm and gravity release arm and into the third ball that navigates a zig-zag track before triggering the see-saw and shooting it the marble into the flag finish box. Finally, unleash your imagination by building a new trail configuration. A finishing flag will raise up for a dramatic ending as your last domino falls. Designed To Develop STEAM Principles Ideal gift for kids four and up, Hape's Robot Factory Domino introduces kids to the concepts of potential energy, momentum and gravity. Using the STEAM value (Science, Technology, Engineering, Arts and Mathematics), this domino set is great for developing logical thinking and understanding of physics principles.