an add on for the game Half life 2. built off of the source engine this game was supposed to be good but is plagued by random headshots, bouncing off of barrels, and huntchback characters. c.s:s is the "next" version of the ever so popular counter-strike. Not surprisingly, c.s:s has failed.
counter-strike: source, far inferior to the original 1.6 version, but fun for rich kids who have loads of money, and also a leading reason why CAL is undergoing much internal turmoil given the recent league changes
CS:S - man, that really ruined CAL...we're all going to UGS