Buyers of next week's Battlefield 3 have a sci-fi surprise in store, as first run copies of EA's shooter juggernaut also include a code to access Mass Effect 3's recently announced cooperative multiplayer mode. The demo will launch in January, though the actual date is yet to be determined.

For the non-cooperatively inclined, don't fret -- the demo will also include a section of the single-player campaign. Users in every region in which Battlefield 3 is available will have access to the multiplayer portion of the demo, provided they buy Battlefield, that is. It sounds like the single-player portion just might be free to all, regardless of your Battlefield status. You can find more information at the official BioWare forums.

This article was originally published on Joystiq.

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