Lego - Chain Reactions

Fascinate your friends by completing an ordinary task in an extraordinary way. Learn to build 10 LEGO® machines that can swing, pivot, roll, lift, and drop. Then connect, rearrange, and experiment with the machines to create a chain reaction. With this book in hand and a handful of basic bricks from your LEGO® collection, the only other thing you'll need is a little imagination.
Includes:

80-page book of instructions
33 LEGO® pieces
Instructions for 10 machines
6 plastic balls
String
Paper ramps