Follow the instructions to build a host of Lego contraptions, like the barbell spinner, flag-waving marble kicker, and more. Then put them in any order to create an amazing chain reaction that accomplishes a simple task. Children will learn some of the physics behind the fun, as well as the skills they need to make their own machines. Comes with a 78-page book, 33 Lego elements, 6 Lego balls, 6 ft. of string, 8 paper ramps, 2 paper pop-up signs, 1 paper funnel ramp, 1 paper flag, 1 paper bucket and 1 platform. For ages 7 and up.