The pictures of cats are, admittedly, adorable. But soon you'll have seen them all and the other thing you'll have realized is that the differences are exactly the same every time the pictures appear. That means the game gets old fast, and the leader board scores have nothing to do with your ability to spot differences. They're all about how well you remember them when you see them again. There's also one very frustrating picture pair in which a glaring difference in the photos is NOT counted, and so you actually lose points for spotting a difference. It was worth trying as a freebie, but I'm very glad I didn't PAY anything for it. Also, some soft-hearted users may find the photoshopped differences, which include cats missing limbs and acquiring other deformities, a tad offensive.