Gotham City Imposters is a squad-based shooter with arcade pacing and a violent sense of humor. Taking the role of well-armed street thugs, players declare allegiance to either the Batman or the Joker, dressing in makeshift capes, tights, or makeup to emulate their choice. Characters are customized by choosing a body type, which affects abilities and hit point ratings, and by selecting a load out of four weapons and gadgets. Teams shoot it out in battle maps inspired by the comics. The online-only game supports up to eight players.

The game does not directly involve the Dark Knight or his insane nemesis themselves, but instead tells the story of the disaffected Gothamites they have inspired to take the fight to the streets. The action is exaggerated with feats of super-human agility and endurance, extending upwards to the rooftops as well as out through shadowy streets and back alleys. Players can use gadgets such as the grappling gun or glider wings to get a jump on the enemy, and opportunely located trampolines will give any Batman aspirant or Joker wannabe a multi-story boost. ~ T.J. Deci, All Game Guide