When Andy develops a severe toothache that prevents him from writing new jokes for their book, Terry uses their fantastical treehouse's money-making machine funds to purchase a Joke Writer 2000, with unexpected results.

"Andy and Terry live in a 39-story treehouse. (It used to be 26 stories, but they added some stuff.) It has the world's highest trampoline, a chocolate waterfall, a baby-dinosaur petting zoo, an active (non-erupting) volcano, a boxing elephant called The Trunkinator, the world's scariest roller coaster, and a level that is so new and so secret that Terry hasn't even finished it yet! Who knows what fun stories and crazy adventures lie ahead? After...

"Andy and Terry live in a 130-story treehouse. (It used to be a 117-story treehouse, but they added another 13 stories.) It has a soap bubble blaster, a time-wasting level, a 13-story igloo, the GRABINATOR (it can grab anything from anywhere at any time), a toilet paper factory, and an extraterrestrial observation centre for observing aliens. As it turns out, though, it's Andy, Terry and Jill who are being observed -- and then abducted -- by a giant...

"Andy and Terry live in a 143-story treehouse. (It used to be a 130-story treehouse, but they built another thirteen stories.) Andy's been a bit stressed out lately, so Terry decides the perfect way to relax would be to head up to their new camping ground level for a much-needed vacation. But it turns out to be not quite as relaxing as planned. Terry forgets to pack the tent and the food, their attempt at fishing ends in disaster, the spooky campfire...