The World&rsquo;s Most Difficult Jigsaw Puzzle, Killer Cupcakes, Double Sided, 500 pieces This puzzle is double-sided with the same image, but one is turned 90 degrees Cupcake themed jigsaw puzzle with 500 pieces Puzzle measures 15 x 15 inches when assembled A Worlds Most Difficult Jigsaw Puzzle for the puzzle fan that needs a challenge! An extreme puzzle challenge for ages 9 and up