Valve has released a new trailer for Portal 2. The cooperative portion of the game features different characters, challenges, and story than the single player portion of the game.
In addition to introducing Merchant, the footage gives a deeper look into Aperture Science and shows off some of the new rendering effects in the game.
Part five shows off the "Pneumatic Diversity Vent," which allows players to dispose of things that blow using a thing that sucks (and in a nice touch, there are no bags to empty).
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