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Populære Steam-guider Skrevne guider, referencer og walkthroughs
Portal - Guide des succès
af Shiryu™
Guide pour réaliser les succès ! Ma chaîne Youtube ...
All Transmissions
af MяPieGuy314™
All of the radio transmissions throughout the game...
Weapon Cheats Guide!
af 
This guide will suprise you of how many weapons there is in Portal! You will need to know how to open up the developer console....
Получаем всё достижения в игре Portal
af Marik78
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Aperture Science Achievement Cheating Guide
af PetTechGuy
This achievement is no doubt impossible to unlock for most people, but if you want to get them by any means necessary without any third-party programs, this video will show you how to do it. This method only works on Windows & Mac and enabling developer c...
Прохождение игры +получение всех достижений
af TroLL
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Transmission Received Achievement
af lonerunner | tradeswap.ga
This guide is intended to help you easier find all transmissions and set them to their final location where they should receive transmission....
Least Time Challenges
af Jimo
I will demonstrate how you can complete all of the Least Time challenges in Portal to work towards the Aperture Science Achievement....
Achievement: Transmission Recived (with pictures)
af |PMG|MiChAeL >D34DLY<
In this guide, I'm going to show you where can you find the radios, and where have you move them to get the achievement. I hope you'll enjoy this guide. :)...
Least Steps Challenges
af Jimo
I will demonstrate how you can complete all of the Least Steps challenges in Portal to work towards the Aperture Science Achievement....