The Original Yes & Know® Invisible Ink Trivia Game Books are perfect for on-the-go play—each book contains 24 pages of interactive learning games, puzzles, trivia and so much more… all in full color! Highlights Hidden Pictures - Silly Stories features classic Hidden Pictures® puzzles woven into humorous stories that encourage careful observation, reading comprehension, and attention to detail. Each book includes a special mess-free Surprize Ink!™ magic reveal pen that snaps into the cover for easy storage, perfect for travel or hours of quiet-time play anywhere.