Perfect Dark is without a doubt the best first-person shooter the N64 has to offer.  Moving along the lines of the great N64 game GoldenEye, Perfect Dark has made what GoldenEye a success and added on to it to create a great game, with much help with the Expansion Pak.  For me, without a doubt, the best one-person level has to be the first one.  Where else can you go through a office building shooting practically everyone you see?  The music and the tone of the level reminds a person of the Terminator movies.  The other great level has to be Chicago-Stealth.  This is another great level that the music and dark tone (which is hypened by the rain) makes a great level that you'd wish the developers had made into a multiplayer level.  The other levels are not as good as these two, but are still great in their own ways.  The sound of the game is another highlight.  I love listening to the bad guys yell "I've been shot!", "Is that a bullet", "Holy-", among others.  These are just classics.  The multiplayer of Perfect Dark is good and bad at the same time.  The good is that you can play with bots.  The bad is that you can play with bots.  Unfortunately, the developers haven't given the player the best multiplayer levels.  The first level on the game itself (inside the Datadyne office tower) would have been excellent.  Anyway, Perfect Dark is a game that helps those who complained that their wasn't enough adult games for the N64.  Perfect Dark is in that category and is a great game.