OC Modshop published another video game walkthrough. This time they guide you through Portal, a game found in the Orange Box.
Quote from the guide: "For the most part, this game is fairly linear. There will be places that you can't get to. This usually involves solving a puzzle. Sometimes it's easier to shoot a portal through a door. Sometimes you have to do it the hard way. The best I can tell you is to keep at it. Really, you shouldn't have to read this guide for every level. The game is fairly straightforward. The only level I had any problem with was level 18 (They didn't fully explain the concept you need to use in the last room of this level, so I was stuck). But now, I am thinking with portals!"
Read the full portal walkthrough guide on OC Modshop.
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