Spot Diff is a prank. Just tell a friend to find the difference between the two pictures and wait... Definitely works best with the volume cranked up to the max! It's probably best that you do not pull this prank on young children, the elderly, or faint of heart, and that your friend is holding the phone in a safe location in case they are surprised enough to let go of it! My apologies to the Pixi’s, I have updated the image sizes for you! Free till the end of the week!