There is a ton of amazing games but it is hard to make a list. but if i would have to say i would go .
(not in order ) legend of zelda ocarina of time , super mario 64, goldeneye 007 n64, quake , doom ,wolfenstein , halo ce , fallout 3 , gta san andreas , metal gear solid , gta vice city , gta 4 , mafia city of lost heaven , bioshock , mass effect , starcraft, call of duty 4 modern warfare( now its overdone) , pac man , red dead redemption , gears of war, shadow of the colossus(mispelled) , god of war trilogy, splinter cell , gta 3 , half life 2 , . overall there is alot and making a list is useless as its just opinion.
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