Andy and Terry have added 13 new levels to their treehouse!

There’s a wishing well, a world-record breaking level, a TV quiz show (hosted by Quizzy the Quizzical Quizbot) and an amazing mind-reading sandwich-making machine!But it’s the night before Christmas, and things are not going well for them – they’re at war with an angry snowman, Santa has crashed his sleigh and fallen into the cloning machine, and Mr. Big Nose wants a new book by tomorrow!

Can they defeat the snowman, save Christmas, and get their book written in time?

Well, what are you waiting for? Come on up!

Climb more fun-filled levels by collecting all thirteen books in the seven million-copy-selling series – the perfect chapter books for reluctant readers.