- Publisher: Valve Software
- Release Date: Apr 19, 2011
- Also On: PC, Xbox 360
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- Summary: Portal 2 DLC #1 will offer new test chambers for players, leaderboards, challenge mode for single and multiplayer modes, and more.
- Developer: Valve Software
- Genre(s): First-Person Shooters
- Cheats: On GameFAQs
- More Details and Credits »
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