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This ad is for the new Diary of a Wimpy Kid: Cabin Fever book. When you go inside the fort thingy go all the way over to where Greg is. He'll ask you if you'll help snowball the Whirley Street Kids. The minigame is kinda hard. You have to hit all 20 Whirley Street kids in a certain amount of time and not hit Greg and his friends. If you win then you get a paper costume that you can costumize for your poptropican and a free chapter of the new book.