Quote Originally Posted by Iscah View Post
That's right. You're thinking the right way in that you need to be hit by a different-coloured beam each time, but the portal colour has no direct relevance to the beam colour. The portals just predictably transport the beams so they emerge out of a side portal of the same colour.

Basically, you want the second beam (emerging from the side) to be a different colour to the first one that went into the portal behind you.

I explained it more step-by-step in this post.

(I think having played Portal helps you quickly get your head around how the portals work. It's the same logic and the game is based around working with more complex portal arrangements than this.)
Very cool. Thanks a lot, you've made my Iconoclasm runs much more enjoyable!