Portal 2 walkthrough part 2...

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MP4 (Source) 1280 x 720 226.93 MB
FLV (Flash) 640 x 360 79.51 MB
FLV (FlashHD) 1280 x 720 138.72 MB
MP4 (480p) 640 x 360 47.57 MB
MP4 (720p) 1280 x 720 144.99 MB