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Popular Steam Guides Written guides, references, and walkthroughs
Portal - Complete Walkthrough
by Khonziel
Complete walkthrough in a single video....
Rattmann Den Locations (Including Secret 6th Chamber)
by ♡ miss raine.
This guide will show you all 6 Rattmann Dens In Portal!...
Terminal Velocity Achievement with details
by OXI
Details on how to get the 'Terminal Velocity' achievement (fall 30k feet) including screenshots and alternate methods....
Camera Shy (with screenshots)
by Mister Jarate
No description, numbers only...
All the challenges
by Xorven
In this place, there are the videos and the objectives of Portal challenges. Achievements to unlock: Basic Science - Rocket Science - Aperture Science Practice is required to earn these achievements. Good viewing ;)...
The advanced chambers (glitches and shortcuts)
by Xorven
There's a little guide about the advanced test chambers. Achievements to unlock : Cupcake - Fruitcake - Vanilla crazy cake Good viewing ! ...
The Quick Camera Checklist
by Slim Dong Huhn
If you want to find the destroyable cameras for the achievement 'Camera Shy' all by yourself, because you want to make this achievement more challenging, use this simple checklist instead of a guide....
Transmission Received Achievement
by lonerunner
This guide is intended to help you easier find all transmissions and set them to their final location where they should receive transmission....
Least Steps Challenges
by Jimo
I will demonstrate how you can complete all of the Least Steps challenges in Portal to work towards the Aperture Science Achievement....
Least Time Challenges
by Jimo
I will demonstrate how you can complete all of the Least Time challenges in Portal to work towards the Aperture Science Achievement....