The 117-Storey Treehouse by Andy Griffiths and Terry Denton now has 13 new storeys, including a tiny-horse level, a pyjama-party room, an Underpants Museum, a photo-bombing booth, a waiting room, a Door of Doom, a circus, a traffic school, a water-ski park filled with flesh-eating piranhas and a treehouse visitor centre with a 24-hour information desk and a gift shop.

Well, what are you waiting for? Come on up! And start colouring in!

Download your free colouring-in activies right here.

The first colouring is of the incredible penguin-powered flying treehouse tour bus!

The second colouring is the giant-robot-fighting arena!

And the third colouring is a secret! Find out what it is here!