The Lego Boost Activity Book is a full-color guide to help readers learn how to build and code creations with the LEGO BOOST robot building kit. The 272-page book from No Starch Press walks through building a basic rover robot called MARIO to learn programming fundamentals. It then teaches how to add features to control movement and make the robot repeat actions and react to colors and sounds. As final projects, readers will build two complete robots: BrickPecker to organize bricks and CYBOT, a robot that talks, shoots objects, and responds to voice commands. The book aims to take readers from beginning builders to robotics experts through illustrations, explanations, and coding examples.