Portal 2: Walkthrough – Part 4 (Chapter 1 Lvl. 5-7)

This is levels 5-7, GLaDOS’ Chamber, and The Incinerator Room in Chapter 1: The Courtesy Call. This is the fourth part of a full gameplay walkthrough of Valve’s Portal 2 on the XBOX 360, Playstation 3, and PC. Played on the Xbox 360.

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