This game is one of the most customizable games I have ever played, almost everything about the game can be changed, without going into the game engine itself. The Source engine is a remarkable next-gen fps game engine that has showed its colors in popular games such as Half-Life 2, Portal, and Team Fortress 2.
Counterstirke: Source is a game for people obsessed with teH l33t K1llz! Perhaps the most hardcore of online shooters, CS:S has evolved into a perfectly balanced gun-down at sundown with every possible tactic and strategy mastered by its religious players. If you haven't been playing CS:S for at least three years, prepare to get rocked.
At first you get kinda PO'd about the "Good" Players, but once you get used to aiming your crosshair and flicking it around and tapping the mouse, you start getting headshots, like theirs no tommorow!
This game is a must have for FPS lovers, and their are barely any hackers on this game, just get STEAM and get CSS, its amazing, not to mention the ragdoll effects are pretty freaking awesome too.
just like the first one but whit better graphics and physics, if you don't mind about graphics you should pick up the orginal first becuse, after all the first one is a classic