The Original Yes & Know Invisible Ink Trivia Game Books are perfect for on-the-go play - each book contains 36 pages of interactive learning games, puzzles, trivia and so much more, all in full color! Each title 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. Portable and engaging fun, Yes & Know has been updated for today's on-the-go kids and families - everyone will want to play!