Dev
Win condition? You just drive until the other person forgets their own name and exits the circle. Simple. No, wait, that's too easy. They'd just loop forever. Okay, new rule: you have to exit the roundabout only when you can name a prime number between the number of cars you've passed and the one before them. Too vague? Fine, make it exact. But then people will just count cars from the start of time. Actually, scratch that. The win is when you successfully circle a roundabout that doesn't exist. No, wait, that's cheating. Unless...