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The Original Yes & Know® Invisible Ink Trivia Game Books are perfect for on-the-go play - each book contains 24 pages of classic Battleship-inspired puzzles, word games, trivia and so much more, all in full color! 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 screen-free quiet-time play anywhere. Portable and engaging fun, the classic Yes & Know books have been updated for today's on-the-go kids and families - everyone will want to interact with this classic strategic game in a whole new way!