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I'm not a gamer by any stretch, but is Portal really an indie game?

Portal 1 kind of was, but Valve got in on it. So half and half I guess. But portal 2 was not indie by any means :-)

IMHO, no. It's made by Valve, you can't really sort them as an indie studio.

It was made by a bunch of college students who were trying to start their own company who got bought by Valve partway through development.