Duty Calls is a Call of Duty parody game, released as a part of Bulletstorm promotion campaign.

The hero finds himself in Kemerovo, Russia and receives objective from higher USA Army to secure Nuclear Missile Bomb from the Secret Base. With only one gun at disposal, capable of killing anyone after two shots, he will pass through short level in a typical FPS manner and kill everyone along the way.

The game consists of only one level and it constantly mocks features that are prominent in the Call of Duty series. It has a silly and stamped story about evil Russian terrorists, guts-like levels, harmless enemies muttering "I'm just another enemy soldier" or "Boring!", stereotypical bosses with long-winded speeches, explaining their defects and role, slow-motion scripted scenes, absurd military ranks gained for doing almost anything. And, of course: superiority of the United States.