Counter-Strike: Global Offensive (CS:GO) is a multiplayer first-person shooter video game. It is the fourth game in the Counter-Strike series and was released for Microsoft Windows, OS X, Xbox 360, and PlayStation 3 on August 21, 2012, while the Linux version was released in 2014. The game pits two teams against each other: the Terrorists and the Counter-Terrorists. Both sides are tasked with eliminating the other while also completing separate objectives. The Terrorists, depending on the game mode, must either plant the bomb or defend the hostages, while the Counter-Terrorists must either prevent the bomb from being planted, defuse the bomb, or rescue the hostages. There are nine game modes, all of which have distinct characteristics specific to that mode. The game also has matchmaking support that allows players to play on dedicated Valve servers, as well as allowing members of the community to host their own servers with custom maps and game modes. A battle-royale game-mode, "Danger Zone", was introduced in 2018.