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Most likely it means something similar to Portal 2's co-op being the main preference over Portal's solo or like a Resident Evil 5/Left 4 Dead where the 2nd player is either AI controlled or human controlled. No more games like Half-Life 1 and 2 where it is only a single player game.
Portal 2 was designed with the preference on single player and then Valve added co-op ability without having to sacrifice the single player unlike the Halo series or other shooters where multiplayer was the preference during development (Halo 3 was about 5-10 people working on solo and 300+ working on multiplayer).
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