Make your creations even more extreme with the Chain Reactions Machine Building Kit. Designed for ages 8 years and older, this book is jam-packed with ideas, instructions, and inspiration for 10 LEGO machines that spin, swing, pivot, roll, lift, and drop! Build each machine separately, or altogether and connect them setting off an epic chain reaction. Includes 33 special LEGO elements that combine with basic bricks from your own LEGO collection. Is compatible to work with the most common of bricks but lists substitutions to use as well.