Portal 2 walkthrough part 2...

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MP4 (Source) 1280 x 720 168.22 MB
FLV (Flash) 640 x 360 70.23 MB
FLV (FlashHD) 1280 x 720 121.95 MB
MP4 (480p) 640 x 360 41.98 MB
MP4 (720p) 1280 x 720 127.44 MB