KIDS LOVE THESE INVISIBLE INK BOOKS!! There have never been quiz or game books that capture your attention like the invisible ink Yes & Know Books. We can remember them from when we were kids and have not seen anything quite like them to come around since. Their long presence in the market place is a testament to their success! Hundreds of challenging questions and games on dozens of different topics will keep your child enthralled for hours! As they compete with the Invisible Ink opponent the Yes & Know pen reveals the invisibly printed answers. Editor's Comments: We can remember our mother's buying these for us when we were kids before we went on a trip. We would beg her to let us play with them before we even left!
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