Warning Puzzle Try and match up the road signs on the cardboard tiles. Not as easy as it sounds, after all it couldn't be the 'world's toughest puzzle' if it were! There are three puzzles in the "Worlds Toughest Puzzle Series: "Danger", "Warning" and "Hazard". This is for the Warning Puzzle. Each puzzle contains 36 printed tiles that need to be arranged in a 6 x 6 square. CLUES to solve this very difficult puzzle are given online. The clue website address is included with the puzzle!