7 years & up. Spin, speed, stretch, or spring into action with brand new high-performance projects in the Klutz® book of Lego Crazy Action Contraptions by Doug Stillinger. Build a Super Charged Speedster, Wall Rocket Racer, Squeezeclaw Grabber and more with clear instructions and step-by-step diagrams for insured success. LEGO®, the LEGO® logo, and the Knob configuration are trademarks of the LEGO® Group. © 2008 the LEGO® Group. Produced by Klutz® under license from the LEGO® group.