This is a very large mod that I started a while ago after playing through the Half-Life Series and Portal. It takes place parallel to and after the original story of Portal. It extends a different perspective and shows a whole lot more about Aperture Science Laboratories.
:January 18th, 2012:
Concept for game mechanics is in beta.
:February 2nd, 2012:
Game mechanics are stable and work on shaders has started.