As the name already tells you, these are cards with a riddle that needs to be solved. The riddle is written on the front of the card, in this case in Dutch (the cards are also available in German and French as far as we know - but we only sell the Dutch ones). But rest assure: the image will make it clear to you what it is all about - so these cards are also a lot of fun when you don´t understand Dutch. And in case you don´t fully understand the text or don´t know the answer: on the back of the card, in the top left corner, there is a small square which hides the answer. You just need to scratch off the layer! These cards are also very nice to send to children, for example for their birthday or during a holiday.