Only one game or one game from each console? If only one game, put my vote down for WCW vs. NWO: Revenge for Nintendo 64.
For each console:
N64-WCW vs. NWO: Revenge
PSOne-Resident Evil 2 Castlevania: Symphony of the Night (Can't believe I forgot this)
Saturn-Dragon Force
Jaguar-Aliens vs. Predator(Highly underrated gem, pick up a Jaguar just to play this people)
Virtual Boy-Wario Land(Again, it's worth the small price of the Virtual Boy to play this masterpiece)
I didn't have or play any of the other consoles.