Complete Portal Walkthrough

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!

Something else to note is that you can't place a portal on moving concrete. When concrete starts to move, any portal that was on it will disappear. Keep this in mind, as some of the Advanced Rooms exploit this fact.

Check it out over at OCModShop.