Following on from Lego's incredibly successful Crazy Action Contraptions
(9781591747697), make amazing moving machines in Lego Chain
Reactions! Children can build eight simple machines that can be
combined to set off a chain reaction. They can use all the included
LEGO pieces in conjunction with their own collection to build
the contraptions and record all their experiments in the pages
of the book. It comes with everything you need, including 20 LEGO
pieces, instructions and paper ramps.