Play Vault: "The premise of Gotham City Impostors is simple, you play as either a group of bored citizens who take up arms to follow their favored hero or villain, (Batman or Joker.) Meaning you side with either the Bats or the Jokerz. Both sides are dressed in a fashion after their idols. You can fight in several modes Team Deathmatch, Psychological Warfare and Fumigation (the later two are just fancy names for Capture the Flag and Domination.) There are some offline challenges so you can practice your skills and get use to the gadgets."