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Half-Life 2 and Portal 2 beta files found in Portal Companion Collection | Eurogamer.net
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![Portal 2: Co-op Walkthrough - Part 1 [1080p HD] (PC/PS3/XBOX 360) (Gameplay) - YouTube](https://i.ytimg.com/vi/JX7R6wvPg8o/maxresdefault.jpg "Portal 2: Co-op Walkthrough - Part 1 [1080p HD] (PC/PS3/XBOX 360) (Gameplay) - YouTube")
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![Portal 2: Co-op Walkthrough - Part 2 [1080p HD] (PC/PS3/XBOX 360) - YouTube](https://i.ytimg.com/vi/8tyAquXtnxI/maxresdefault.jpg "Portal 2: Co-op Walkthrough - Part 2 [1080p HD] (PC/PS3/XBOX 360) - YouTube")
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![Portal 2: Walkthrough - Part 1 (Chapter 1) (PS3/X360/PC) [1080p HD] (Gameplay) - YouTube](https://i.ytimg.com/vi/43CL70JT4bY/sddefault.jpg "Portal 2: Walkthrough - Part 1 (Chapter 1) (PS3/X360/PC) [1080p HD] (Gameplay) - YouTube")