These 500 piece jigsaw puzzles each have the same image on both the front and back - however, one side has been turned sideways, making it very challenging to figure out which side is up!Each piece has been identically cut from both directions so that even expert puzzlers won"t be able to tell one side from the other - if you"re ready for the ultimate extreme puzzle challenge, this is the puzzle for you. Finished puzzle size is 15" x 15". Released 2012.