Portal 2

We're all still waiting for the next Half-Life, that's no secret. In the meantime, Valve has been very busy. Between Left 4 Dead 2, Dota 2, and ongoing Team Fortress 2 updates, there's a lot going on at the home base of Gordon Freeman. That includes the sequel to Portal, one of the most welcome surprises of gaming's modern era. With Portal 2, the hilariously maniacal robot GlaDOS is back and part of a much more

fully-featured single-player game.

While it's exciting to think about all the insane puzzles Valve is putting together that take advantage of all the new mechanics in Portal 2, what's especially interesting is the co-operative mode. Instead of Chell, the two-player mode stars two robots, each with their own portal guns. That means four portals total with which to overcome obstacles. This game is going to be crazy.
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