Platform(s): Windows, OS X, Playtation 3, Xbox 360, Linux
Release date: August 2012 (Published by Valve Corporation)
This is a multiplayer first person shooter game developed by Hidden Path Entertainment and Valve Corporation. The forth game in the series, with it's latest release on Linux in 2014. Two teams pit against each other, while trying to eliminate each other, while carrying out different objectives. There are eight different game modes, which have distinct characteristics that are specific to the particular mode. Valve Corporation sponsors tournaments, which are considered the premier competitive events for the game. The game play includes five categories of purchasable weapons.