Build 16 high-performance LEGO projects children can make amazing moving machines in Lego Chain Reactions! It includes more than 100 LEGO elements in 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).   They are selected 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.
 
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