Part 1

Complete Portal walkthrough covering all test chambers, advanced challenges, and achievements. Updated 09/04/2008.

Version History:

• Version 1.0 (4/28/2008): Completed Full Guide, Advanced Chamber Guides, Least Portal Guides, Least Steps Guides, Least Time Guides.
• Version 1.1 (6/4/08): Fixed minor formatting errors, added Zeladine's tip to the turret firefight, added Dark Tail's tip to the Least Step Chambers Guide.
• Version 1.11 (9/4/08): Fixed spelling errors, added individual achievements to the Table of Contents.

Legal: This guide is copyright 2008 by Michael Mays. It may not be reproduced, altered, or republished without permission. Sites allowed to host this guide are www.gamefaqs.com, www.gamerstemple.com, www.supercheats.com, and www.neoseeker.com. This guide is for private use only.

Introduction:

Commentary Nodes may contain minor spoilers or hints relating to the current test chamber. These boxes only apply to commentary mode.