You guys are beginners! You haven't played X-Com/UFO Enemy Unknown!? Theme Park!? Master of Orion!? ...... I feel old.....
... Oh wait, 1998..... Err.... Diablo 2. Mortal Kombat 4 (Still treasure it to this day. Hehe.
) . Counter-Strike ? I think it was released on 2000 though. Quake 2.