Build 16 high-performance LEGO® projects Following on from Lego's incredibly successful Crazy Action Contraptions (9781591747697), children can make more amazing moving machines in Lego Chain Reactions!  We've included more than 100 LEGO® elements with this construction kit. Not coincidentally, they're exactly the bunch of bricks you need to make all 16 Crazy Action Contraptions (but not all at the same time). We selected these elements for their mechanicals flexibility, utility, and general awesomeness and then got the work building the best LEGO® vehicles, launchers, noise-makers, gadgets, and games around. Parents’ choice award winner Includes every brick, gear & Axle you need to create 16 unique projects Comes with 105 LEGO Bricks Includes a 50 page instructional book with Klutz Certified crystal-clear instructions 1.5+ million copies sold Recommended for children ages 7+ What is Klutz? Klutz is a premium brand of book-based activity kits, designed to inspire creativity in every child. Our unique combination of crystal-clear instructions, custom tools and materials, and hearty helpings of humor is 100% guaranteed to kick-start creativity. Super-clear instructions Open-ended Creativity Rewarding Reading Skills to Build On Everything You Need