Come hang out in the biggest, most astonishing home in the world! Andy and Terry have added thirteen brand new levels, bringing their massive hideaway to a staggering one hundred and sixty-nine stories. If you thought the fun could not get any bigger, wait until you explore the electric pony stable, shout in the NOISY level, control the skies in the weather dome, or snack on the fully edible gingerbread house. You can even use the new potato-powered translation transmitter to talk to everything, everywhere, all at once. But life above the ground is never perfectly peaceful. While trying to hide from the school inspector Mr. Bunkoff in the new hall of funhouse mirrors, the boys face a much worse problem. Their trouble-making opposites, Anti-Andy, Terrible Terry, and Junkyard Jill, are trapped inside the mirrors and desperate to break out. Add in a furious publisher demanding their new book right this second, and you have a recipe for absolute disaster. Find out if our heroes can dodge school, defeat their doubles, and beat the clock in this hilarious adventure.