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Portal 2 Perpetual Testing Initiative Trailer

Introducing the Perpetual Testing Initiative (PeTI) for Portal 2, which combines the powerful, easy-to-use Puzzle Maker and full Steam Workshop integration.

28 April 2012 | 845

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01:56
Co-op Trailer
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01:56
Co-op Trailer
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01:56
Co-op Trailer
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03:40
Gameplay Trailer
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Gameplay Trailer
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01:54
Demo Part 4
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Demo Part 4
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Demo Part 4
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