It's tough to pick the best of the best when it comes to CoD campaign missions, but few stand at the top as masterpieces.

World at War — free Steam account. Dark atmosphere of World War II, epic battles, storming of Berlin and harsh realism.

2. All Ghillied Up - Call of Duty: Modern Warfare Just like Vendetta in World at War, this mission is all about proper resilience and patience. One wrong step, and you are gone. All Ghillied Up ...