Call of Duty: Black Ops is a first-person shooter video game developed by Treyarch and published by Activision. It was released worldwide for Microsoft Windows, PlayStation 3 and Xbox 360 on November 9, 2010. The game is set during the Cold War and follows the story of Alex Mason, a CIA operative who is tasked with uncovering the truth behind a conspiracy that threatens to destroy the world. Black Ops features a variety of gameplay modes, including a single-player campaign, a cooperative mode, and a competitive multiplayer mode. The game was a critical and commercial success, selling over 25 million copies worldwide in its first week of release. The game is known for its gritty and realistic depiction of the Cold War, its fast-paced action, and its innovative multiplayer gameplay. The game is a must-have for any fan of first-person shooters, or fans of the Call of Duty franchise in general.