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As excited as we are for Portal 2's brain-bending single-player gameplay, it's easy to forget that this time around Valve is adding in a co-op mode. The latest trailer for the game introduces the two robotic companions who will star in this portion of the game.

Although this trailer from the Spike VGAs doesn't show any actual gameplay, it does give a good sense of the whimsical tone Valve is going for with co-op. You know what that means: No getting angry at your buddy when he or she accidentally misplaces a portal at the last second, sending you into a spikey death trap. It's all for fun!

Check out the video for yourself below.