It was made possible in part by a generous grant from Aperture Science! It's free for the PC too, and it's all a part of Steam's plot to take over the world! Uh, I mean to promote Portal 2 (with co-op play). Portal is one of the best games ever, and one that makes your brain hurt (in a good way). Oh, and thanks Jonathan Coulton for writing such a catchy credits song.
