How good are you at drawing circles? Draw a circle anywhere on the screen and click SPACE (doesn't have to be in the middle) and the program will find the "center of mass" of your circle, figure out the average radius of the circle, and find the distance from each of the points in your circle to the closest point of the perfect circle which it adds to the fail variable. I've seen this project in a couple of places already, but most of them just had an invisible circle in the middle, and any points on your circle that didn't touch the "perfect circle", would give you -points.
Math, i just used math...