Friedemann Friese's Folders is a set of 7 mazes, in a range of difficulty levels, designed by famed designer Friedemann Friese. These are not just any mazes, however! The mazes are on a double-sided card, with a single fold on the card that turns an ordinary maze into a mind-bending exercise. You will need to fold and unfold the card throughout your maze navigation, utilizing both sides of the card in the process, in order to solve each maze.
This set does NOT include the Christmas card maze pictured in the video
You can also see a quick demo of the product here in order to understand it a little better: