Portal 2 Single Player Walkthrough Details Is GLaDOS, Wheatley and the portal gun getting the better of you? With this complete single player walkthrough, we will guide you safely and easily through the treacherous Aperture Science labs to make your Portal 2 trip an enjoyable one. Can't work out where to put your portals, or even how to use those confusing gels? Fear not, we are here for you.Formats: Xbox 360

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