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Number of Online Players: Massively Multiplayer see related links
Massively multiplayer online role-playing game(MMORPG)
It doesn't need one unless you want to connect to the PSNetwork, or play multiplayer online.
To download it from the website you need internet connection of course but once it has been downloaded you can play in singleplayer with no internet. To play on a multiplayer server you do need to have internet.
If you have a PS3, X-Box 360, or Wii, you have to have an internet connection. PS3 requires you to make an internet connection and create a PSN account, then you can play online. X-Box 360 requires an internet connection, then you have to sign up for X-Box Live for online play. And as for Wii, you have to make an internet connection, and that's it.