The lights are on
Whether it's Half-Life's well-polished single-player experience, Left 4 Dead's intense multiplayer mayhem, or the amusing puzzle-like experience that was Portal, it's hard to argue with Valve pedigree, but you can certainly try if you'd like.
Well, you bring up some good points, but I'm sure they can work something out; the events of Portal and Portal 2 happen during the events of the Half Life series as well, so perhaps finally having those two overlap somehow could work to solve the problem. Honestly, I'd be fascinated if she had a role in Episode 3. It would be the perfect way to tie the two stories together.
"True knowledge is birth, and also death."
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Everyone has there ideas and such. Me I think this would be the end. Portal 2 was the end to me. The game ends with GLaDOS letting you leave without a scratch. You finally see where Aperture is and how the world is. I think Valve want the game to end this way. I mean you might be a super-fan saying that can't be the end, but I say what is there to continue? With chell coming back or more people being tested? I thought GLaDOS want her leave because she couldn't take it any more.
What ever you would to say go ahead, I like what people have to say about this game.