Also available is the Escalation game mode, the only multiplayer mode where players can control characters from the campaign or downloadable content. Players choose a faction and then work cooperatively to defeat continuous waves of enemy robots until all players are defeated, similar to the Horde mode found in Gears of War and the Halo series Firefight game modes. Players earn credits by defeating enemies which can be used to unlock ammunition, weaponry, health and new areas in each map.[1]