Gotham City Impostors is now free for Xbox 360 via Games with Gold
Impostors is a multiplayer, first-person shooter based on DC Comics' Batman universe. It pits two teams of six players against each other as the Bats and The Jokerz battle it out using "insane costumes, homebrewed gadgets and a wide range of traditional and imagined weapons." Gotham City Impostors is the first of two free Xbox 360 games planned for July. It'll be available to download for free until July 15, and will then be replaced by BattleBlock Theater.
As for you Xbox One owners, Major Nelson has confirmed Guacamelee! Super Turbo Championship Edition be available for free through Games with Gold starting Wednesday, July 2. It replaces Halo: Spartan Assault. In the meantime, you are still able to download Max: The Curse of the Brotherhood which is free for a second consecutive month.