DR Puzzle Spot the Difference: 1000 piece challenging puzzle for adults. Mint condition. Once you assemble this cheerful puzzle, you can look a the full color poster sheet to find small differences between the images. A solution is on the back. This interlocking jigsaw puzzle is made of quality, thick recycled paperboard and is 27x20” when completed. Relax, kick back, and enjoy assembling this sweet puzzle and then put your brain to work. Work your brain with Dr. Puzzle!