This is the "World's Most Difficult Jigsaw Puzzle" [Cat Edition] from Buffalo Games. It has 529 pieces, and the images of the cats are almost identical on both sides, with one side printed rotated 90 degrees, making it a very difficult puzzle. It has been stored unopened at home for a long time. There is some dirt on the plastic wrapping on the back. It's difficult to tell the front and back apart, and the design is complex, so enthusiasts say it's "a swamp" (difficult to escape). Size: 38cm x 38cm Brand: Buffalo Games USA ☆It is said that the production time and difficulty are roughly equivalent to a 1000-2000 piece jigsaw puzzle. Please note that we will use a recycled box for shipping. Type...Jigsaw Puzzle Number of pieces...500 pieces - 999 pieces