LEGO Chain Reactions is packed full of ideas, instructions, and inspiration for 10 LEGO machines that spin, swing, pivot, roll, lift, and drop. Each machine alone is awesome, but put them together and you get incredible chain reactions. Then, combine the machines in any order you like to create your own chain reactions. Book includes 33 special LEGO elements that combine with basic bricks from your collection to make your machines go. Comes with: 78 page book, 33 LEGO elements, 6 LEGO balls, 6 feet of string, 8 paper ramps, 2 paper pop-up signs, 1 paper funnel ramp, 1 paper flag, 1 paper bucket and 1 platform. Lego Crazy Contraptions features 16 different spinning, speeding build-outs and includes all the plates, axles, bricks, wheels, gears, connectors, bushings and bands needed to create them. Build a Supercharged Speedster that can coast over 50 feet, or extend your reach by making a Squeezeclaw Grabber! Each project has easy, step-by-step instructions and troubleshooting tips.