Young builders connect, rearrange, and experiment with the LEGO® machines for endless possibilities. Our step-by-step instructions make it easy to build the Flag-Waving Marble Kicker, the Barbell Spinner, and more. Kids set up these machines in any order they choose to form a custom chain reaction. One thing leads to another, and another, and another, as the machines perform an ordinary task (like pressing a button on a keyboard) in an extraordinary way. With this book in hand and a handful of basic bricks from their LEGO® collections, the only other thing that LEGO® fans will need is a little imagination.For Ages: 9+WARNING: Small parts. Choking hazard. Not for children under 3.