Also spawned Counterstrike one of the best online FPS ever created until the hackers ruined it. Didn't take long...I can't watch the current CS:GO tournaments because it makes me sick to my stomach knowing that these guys cheat and get away with it in a compe ive tournament. Like Vander said, gaben. HL1 and HL2 will forever be the pioneers along with Wolfenstein,Doom,Quake,etc...