Just watch. I made an interactive version too, if you want to feel like you're playing. See inside for more info as to how it works, but there is a little 'for dummies' description below: There is a little ghost, and the circle is supposed to follow the ghost, duplicating itself as it goes. It also changes color in a way that makes it look subtle and pretty, and it's satisfying to watch the circle chase the ghost.
Thanks to Griffpatch, as I got the idea for this from his "Scratch Emulator". I love all his games. I hope you find this satisfying to watch, ads in the comments are allowed, you can also give me feedback, and remember to heart, star, and follow!