Inspired by a similar project, I (@A1056) tried to recreate the perfect circle detector on my own, and succeeded! Just click the green flag, and keep the big purple circle as the center point and try to draw a perfect circle around it. The AI will tell you if it is perfect or not.
The project that caused my inspiration: GUYS I AM NOT ABLE TO FIND THAT PROJECT. I AM REALLY SORRY ABOUT THIS. I USUALLY GIVE CREDIT, BUT THAT PROJECT SEEMS TO HAVE JUST, DISAPPEARED. :-( I WILL POST THE LINK HERE WHEN I FIND IT. IF ANY OF YOU HAVE SEEN A SIMILAR PROJECT BEFORE, THEN PLEASE SHARE THE LINK WITH ME. THANKS