Counter-Strike is a first-person shooter video game for the computer. It was made by Valve Corporation in 1999. In this game, you play as special United States soldiers disguised as terrorists and doing secret missions. One team plays as the terrorists and the other plays as the "counter" terrorists (US soldiers). You play online against each other, each team having different objectives, or "goals". This game was at first a fan-made mod of the classic game Half-Life but was later bought by Valve and turned into a real game marketed and sold in retail stores. It is commonly refereed to today as one of the best video game mods ever made.