PortalThe insanely popular Half Life mod gets the Flash treatment.
EDIT: 3.21 thanks guys!
EDIT: Thanks so much for putting me into the collection :D
Gotta love them cubes. Anyway I made this flash over the space of a couple of days, I got most of the audio from the game itself and I had a hell of a time trying to screen shot the game without weapons showing but I got it working eventually. Enjoy ^_^