I read on the internet that the level of difficulty for this puzzle is rated as advanced. I agree with that rating. It is a challenge. We usually have all the border pieces assembled in a day or two on other puzzles we have done. We have been working on this one for a week and have not found about 5 pieces of the boarder. The boarder pieces are more cleverly cut than other puzzles we have done. After 2 days, we moved on to assembling the puzzle and we find a boarder piece and install from time to time. Because this puzzle is a night time scene, the colors are subdued and more difficult to locate in the picture of the puzzle. The pieces of this puzzle are not all square shaped with only slight differences. They are much more unique which helps you use shape as a clue for assembly. I am sure we will love the picture and feel a sense of accomplishment when we finish..