The World's Most Difficult Phone Icons Puzzle A seriously difficult double sided puzzle of Phone Icons! It actually only has 529 pieces but it will feel like 4,000! This fantastic puzzle, aptly named the World’s Most Difficult jigsaw puzzle, will have you hooked for hours as you try to figure out where each piece connects. Each side features exactly the same artwork, images of phone icons and so it’s impossible to tell which side is which - it will really have you scratching your head! Each side of the puzzle has the identical image offset 90 degrees from each other which is cut from both sides so it is impossible to tell which side is which! Each piece must be compared on both sides for size, shape, colour and fit. If all this sounds confusing just wait until you try it. The World’s Most Difficult Phone Icons puzzle is made from high quality card and comes presented in a rectangular box which has been shrink wrapped for further protection. The Finished puzzle measures 384mm x 384mm. For age 12 plus Safety warning: Not suitable for children under 36 months, small parts, choking hazard.