Portal 2 walkthrough part 3...

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MP4 (Source) 1280 x 720 182.67 MB
FLV (Flash) 640 x 360 68.36 MB
FLV (FlashHD) 1280 x 720 119.16 MB
MP4 (480p) 640 x 360 40.83 MB
MP4 (720p) 1280 x 720 124.52 MB