

In addition, the game also introduces fully-customizable emblems, custom character appearances (based on unlockable face paint and the "Perk 1" perk chosen), the "Contract" system (which allows players to earn bonus CODPoints and experience by achieving certain goals in a specific amount of time), the ability to customize game modes for lobbies (along with a File Share system similar to Halo: Reach to store those modes), automatic replay saving (which can be watched, alone or with others, in the new Theater Mode, or uploaded to Youtube), split-screen support in online multiplayer, and two new types of online playlists: Wager Matches (which allow players to gamble CODPoints in one of four special six-player free-for-all game modes) and Combat Training (which allow players to practice against AI opponents). The multiplayer from Call of Duty: Modern Warfare 2 returns, adding a new currency system ("CODPoints", earned through regular gameplay) that is used to purchase weapons, accessories, and customizations. As Alex figures out the events leading to his interrogation (including operations with fellow operatives Frank Woods and Joseph Bowman, while sometimes accompanied by his fellow gulag inmate, and former Red Army solider, Viktor Reznov), he uncovers a vast Soviet conspiracy (led by General Nikita Dragovich) involving a deadly nerve agent ("Nova-6"). In the main single-player campaign, players take the role of Alex Mason, an operative of an elite United States black operations unit (known as the Studies and Observations Group, or SOG), who must recall several events over a six-year period after hallucinating random sequences of numbers around him. The seventh official installment of the Call of Duty series (and the sequel to 2008's Call of Duty: World at War), the game shifts from World War II to the 1960's era of the Cold War. It was later released for the Mac on September 27, 2012. Call of Duty: Black Ops is a first-person shooter developed by Treyarch and published by Activision ( Square Enix in Japan) for the Xbox 360, PlayStation 3, Wii, Nintendo DS (ported by n-Space) and PC on November 9, 2010.
