Design and build LEGO® brick machines that can swing, pivot, roll, lift and drop with this LEGO Iconic 5005629 Chain Reactions craft kit! You supply the LEGO bricks from your collection; we supply an inspirational 78-page book with crystal-clear instructions and the extra parts you need to transform your bricks into 10 different wacky chain reaction machines, from a seesaw and ramp to a pop-up flag and falling hammer. Teach your bricks new tricks, fascinate your friends by completing ordinary tasks in extraordinary ways, and invent your own awesome chain reactions.