Among the most interesting puzzles to do are gradient puzzles. The sorting of the pieces can be done systematically and pieces can be located in the puzzle by color and how it relates to the other colors in the puzzle. This fractal lines and shapes add more clues to the puzzle piece location. The final image is colorful and interesting to look at. The final dimensions of this puzzle are 27.2" x 19.7"For Ages: 13+WARNING: Choking Hazard; Small Parts. Not for children under 3 years old.