Two hidden games were included with Activision’s Call of Duty: Black Ops, both of which could only be discovered after escaping from your character’s confinement on the menu screen. The first, Dead Ops Arcade, is a top-down zombie shooter whose twin-stick control scheme is reminiscent of such quarter-munchers as Robotron and S.M.A.S.H. TV. The second is the classic Infocom text adventure game, Zork. Each game is unlocked by typing in a command at a CIA computer terminal.