A remake/update of the original Counter-Strike, running on the Half-Life 2 Source engine. This title was made available through Valve's Steam downloading service in October of 2004, with a retail release in the Fall of 2005.
With a full complement of real world pistols, rifles and shotguns, Counter-Strike's battle of terrorists and counter-terrorists became the basic blueprint for many modern team-based online shooters. Now enhanced with the power of the Source engine, the game features drastically improved visuals, enhancements on classic maps, offline skirmish play with AI bots and more.
The retail version of Counter-Strike: Source also includes Half-Life 2: Deathmatch and Day of Defeat: Source.