Explore the vast, surprising and silly world of the Treehouse with your expert tour guides, Andy and Terry. There are so many things to know. And so many things you didn't know you didn't know! This guide to the Treehouse is full of trivia, fun facts and behind-the-scenes details about all 169 levels, all the characters Andy and Terry have met, the places they've visited, and all the amazing gadgets and machines they've invented.