Portal 2 walkthrough part 2...

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MP4 (Source) 1280 x 720 171.96 MB
FLV (Flash) 640 x 360 77.38 MB
FLV (FlashHD) 1280 x 720 134.88 MB
MP4 (480p) 640 x 360 46.29 MB
MP4 (720p) 1280 x 720 140.93 MB