Simply choose if you want a guide or not then draw your attempt at a perfect circle. Make sure the center of the canvas is somewhere INSIDE your circle. Once finished, the game will draw a perfect circle with the same radius and center as yours and compare it, can you beat the high score! To try again press the flag.
NOTE: High scores can only be set when using no guide and if you have scratcher status. I updated it to find a more accurate center point on your circle, it now finds an average of all possibilities, all possibilities are marked in blue with it's average marked with a black 'X'. I also reset the highscore so a new one is ready to be set with the new system.