Dec 5, 2016 Counter-Strike: Classic Offensive is a mod that brings key aspects of Counter- Strike 1.6 into Global Offensive, preserving some of the game's. Counter-Strike (officially abbreviated as CS) is a series of multiplayer first-person shooter video games, in which teams of terrorists and counter-terrorists battle. Counter-Strike: Global Offensive (abbreviated as CS:GO) is a multiplayer first- person shooter video game developed by Hidden Path Entertainment and Valve. Counter-Strike: Source is a remake of Counter-Strike using the Source game engine. As in the original, Counter-Strike: Source pits a team of counter-terrorists.