Robbers-These players are usually considered survivors in the infection version of this game type. They must attempt to follow the Cop's order if they are in prison or they must escape and run away from the Cops. They cannot kill the Cop unless they assassinate them from behind.
Cops- Zombies, who have more health and power then robbers. They must follow the "HONOR" rules of the gametype and can only kill a Robber if he commits an offense(attacks a cop, runs away, etc...)They can also order a robber to follow his orders
So basically you have to kill each other to survive but with a twist. The thing I hate about this gametype is how we have to follow the honor rule which makes this gametype difficult for Cops who are Trigger Happy and possibly dont have a mic. In order to ensure you have a steady Cops N Robbers game is to make sure everyone has a mic, and that the party leader will be willing to boot anyone from the party for violating the honor rules.