Well, I was on Steam when I noticed a source mod that caught my eye. So I clicked on it, and found out information about it. I when went to download it. One thing. It said I required a source game. Portal has Source SDK, I've checked. So I clicked again, thinking it was a mistake. Same thing. Now I'm pissed, because it says that Portal will work, but First Slice won't work. Does this mean Portal DOESN'T work?