When prompted for a name, type the actual number of the name. This corresponds to that person, not the name itself. If a prompt continues to pop up, you have entered an invalid response. You can't kill or save someone who's dead.
To play Mafia, the Mafia selects a person to kill. The Doctor selects a person to save. The Cop selects a person to investigate. Unless the person being killed is saved, the person dies. The investigated person is voted on and with a majority is killed. Kill the Mafia to win! If you are the Mafia, you win if everyone else dies.
