Watch the Portal 2 Cooperative Testing Initiative

VIDEO: Latest Aperture Science trailer teases two-player co-op

If you haven’t seen it already, you should really check out Valve’s latest Aperture Science video. It teases Portal 2’s new two-player co-op mode and promises good times with puzzles, portals and pals. Also,don't forget to check out our recentpreviewfor our impressions of the new co-op mode from PAX 2010.

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