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Portal 2 Walkthrough / Chapter 4 - Part 3: Room 20/22

Check out this Portal 2 walkthrough and beat Chapter 4 - Part 3: Room 20/22 with this online demo. Spoiler alert! These walkthrough videos feature both gameplay and cutscenes from Portal 2. For more Portal 2 walkthrough videos from Howcast, go to http://www.youtube.com/view_play_list?p=EB913E53B9C2F8FF
Length: 02:03

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