The N64 version was truly amazing. Somehow the Xbox 360 enhanced port even better. They made several changes that make it the definitive version. Yes there is online multiplayer. I even felt this is one of Rare's greatest games ever!!! The soundtrack absolutely mind blowing. Surprisingly great sound effects you'll remember for years. Plenty of fun weapons to use with some having secondary functions. This is essentially an futuristic GoldenEye game. You got a truly solid campaign you can replay. You also can unlock cheats that are very fun to play with. Perfect Dark is the very definition of perfection.