NWN is a RPG which has it's main focus on Online Play
but it's not limited to that
There's a Single player mission that is about 50 houres (though not as big as BG it's a pretty long mission) and people will be able to make their own missions. That means when you finish you singleplayer mission, you'll be able to download other missions.
more info on
http://www.neverwinternights.com
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