2001 is hardly ancient!
But anyways
Pokemon Blue (Gameboy 1997), cause of the nostalgia, and for being the one that started it all. (even though the franchise has gotten out of control)
Lego Island (PC 1997), first lego game ever, and one of my personal favorites.
Sid Meiers Civilization (PC 1991), sooooo advanced for it's time. The strategic options seemed to be endless, and the AI is super hard to beat (I still haven't beaten the hardest level :S) Probably one of the greatest games ever created.