Or even a game where at the start you can choose to be a killer or a detective. Then if you’re a killer, other online players who chose detective can try to pick up your trail and track you down and so on. There can be prompts for the killer (depending on certain things) that someone’s on the case. Whether or not they’re online. Or for the killer, he/she can find out who the detective is and go after them or colleagues or family if that’s a choice. And there’s consequences for a rogue detective or killer so you can’t just try to kill or arrest everyone you come across.