Dead Ops Arcade is an unlockable game mode that the player can unlock by typing "DOA" within the data terminal of the main menu.[24] Once unlocked, the player is transferred to play a retro arcade version of the main zombie's game mode. New elements like extra lives, unique mini maps, and zombie bosses are present within the game mode. Dead Ops Arcade includes co-op playthrough through either Xbox Live or split screen of up to 4 players.[25]