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Portal 2 multiplayer screens from PAX will win your heart

We still haven't been told the names of the two robots cooperatively making their way through an Aperture Science facility in Portal 2, but that doesn't matter -- we'll name them Red and Blue. In the screenshots below, released today by Valve, you can see our dashing nonhuman heroes hitting switches, diving into portals and just plain oozing personality.

In fact, even without seeing them move, we can already tell all sorts of things about how they act together. Red seems a little more timid and reserved, while Blue appears to be a go-getter who gets things done. Then again, look at that swan dive Red's pulling off. That's a thing of beauty right there. Curse you, Valve! You've already made us care about them so much!%Gallery-101341%