Counter-Strike: Source

From BIGBIGHUGE WIKI

Counter-Strike: Source is a game made by Valve. It is a popular multiplayer first person shooter in which two teams, terrorists and counter-terrorists, fight. To win, the counter-terrorists must rescue hostages, defuse a bomb, or kill the entire enemy team. For the terrorists to win they must detonate the bomb or kill all the counter-terrorists.

Since its introduction there have been many user created maps, such as glass maps, and a number of Mods, such as surf.