Portal Pro is a set of test chambers focusing on solving puzzles locally rather than using complex fling techniques. The goal here is that the solutions are hard to come up with but easy to actually do.
ATTENTION: If you do not have the SteamPipe update for Portal than this download will not work for you. Download version 1.1 instead. Click "read more" to see how to tell what version you have. This release is pretty much the same as version 1.1 but with the SteamPipe patch applied and the caption bug fixed.
This update includes two minor fixes since version 1.1:
How to find out if you have the SteamPipe version of Portal: