The 52-Storey Treehouse by Andy Griffiths and Terry Denton
Andy and Terry’s incredible, ever expanding treehouse has thirteen new storeys including a watermelon smashing level, a wave machine, a real life snakes and ladders game (with real snakes and ladders) and plenty more.
I recommend this book because it is funny. The main point is about when they try to find Mr Big Nose their publisher and end up getting eaten up for lunch by veggies! How ridiculous.