The Captain Underpants Extra-Crunchy Book o' Fun

The Captain Underpants Extra-Crunchy Book o' Fun is an activity book based on a series of children's books by Dav Pilkey with Captain Underpants in the titles. It was released in between Captain Underpants and the Perilous Plot of Professor Poopypants and Captain Underpants and the Wrath of the Wicked Wedgie Woman.

Trivia

• 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.
• This book had a sequel entitled The All-New Captain Underpants Extra-Crunchy Book o' Fun 2.
• Hairy Potty is a parody of Harry Potter.
• Dav Pilkey explained that the reason he made this book is that he only had enough energy to make an activity book. This was after Captain Underpants and the Perilous Plot of Professor Poopypants. This book is not in the series itself.