This is an interesting puzzle. The hardest part was getting the outer pieces put together -- the shape of the puzzle makes it difficult and there are a lot of edge pieces that just sit next to each other without locking in until you get the inner pieces done. It is a good quality puzzle, and it was easy to know whether a piece was placed correctly or not, with little problems separating if you tried a piece in the wrong spot. The entire puzzle, when completed, can be lifted up without the pieces falling apart. Pleasantly surprised with this one!