In each level there are 5 differences, simply click to reveal a difference. The faster you are at finding differences without mis-clicking the higher your score. There are 5 levels in total, each designed by Keepwalking based off 5 of his images from Newgrounds own art portal. If you at any point are lost simply click the Walkthrough link and you can watch any of the 5 videos with solutions to each level. Press P to pause and M to mute the music.