Portal: Insane Aperture's page on ModDB. Storyline and more info are in the full description.
Why not use a cooler colour instead of red? Raise the black platform as well.
You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.
2000 characters limit; HTML formatting and smileys are not supported - text only
I have finished Testchamber 3, and here's how the level transition looks like. It is still a little buggy, though.