The PS3 version of Portal 2 comes with a code to link it to a Steam account. Apparently this allows you to play on both the PC and PS3 with one purchase.
Can this be used to play co-op between the two platforms?
Ps3 – Can Portal 2 co-op be played between PC and PS3 Steam linked accounts
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Best Answer
According to EA, you can play Portal 2 Co-op cross-platform between the PS3 and PC versions.
However, I would assume the PS3 functions just like another PC with Steam, where you can't be logged in and online at two places at once (kicking one client off). If that holds, you would be unable to play co-op with yourself (your own account) if one's on a PC and the other on PS3.