You know what single-player RPG trilogy Mass Effect was missing? Multiplayer! Of course. The poorly kept secret has now been confirmed to exist by Aussie mag, PC Powerplay, as noticed by Eurogamer. Although it looks like it might be a bit early to start getting to wound up in any particular direction, since the information contained within the magazine is still unknown. It seems likely that there's going to be some manner of co-op mode, but as something separate from the main game (where two Commander Shepards might be a touch strange). In other words, any multi-wooing elements shouldn't effect the core game. BioWare are smarter than to let that happen.
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