Throughout the pages of the “Line Up Yes & Know” book, a detective story unfolds, complete with activities to finish, clues to chase, and bad guys to catch. As kids work through the puzzles presented on each page, they can use the special Lee Publications invisible ink pen to reveal the answers and make invisible images appear.
― Out of 39 retailers, four named activity books from Lee Publications as their top-selling travel item in March 2010, reporting sales averaging 24 per month.
― Kristen Dolle, manager of Playthings Toy Shoppe in Louisville, Ky. told TDmonthly in late Spring 2011 that Magic pen books by Lee Publications were a best-selling travel toy.
— In an April 2012 survey about best selling travel toys, Joe Berardoni, owner of Pun's Toys in Bryn Mawr, Pa., told TDmonthly: "As a category, Lee Publication’s Yes & Know books continue to sell out during travel time due to their wide age range and low retail price."
— Want this? As of 05/06/2011, this product was available for purchase at Playthings Toy Shoppe.