Call of Duty: Black Ops takes place during the 1960s in the Cold War. It focuses on CIA clandestine black operations carried out behind enemy lines. Missions take place in various locations around the globe such as the Ural Mountains in central Russia, Cuba, Kazakhstan, Hong Kong, Laos, Vietnam, and the Arctic circle. The single-player campaign revolves around an experimental chemical weapon codenamed "Nova-6".
Only keys listed as "Region Free" can be redeemed in any country.
EU Keys can only be redeemed within the EU.
US Keys can only be redeemed within the USA.