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The Captain Underpants Extra-Crunchy Book o' Fun is an activity book based on the Captain Underpants book series. It was released after Captain Underpants and the Perilous Plot of Professor Poopypants and before Captain Underpants and the Wrath of the Wicked Wedgie Woman. This book features a Captain Underpants comic (Hairy Potty and the Underwear of Justice), a mini-test, jokes, crossword puzzles, Flip-O-Rama tips, comic-making tips, word searches, mazes, and more.

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