Subterranea (Work in Progress - NEED FEEDBACK)

[Bulbatron]

This is sort of embarrassing. I think I asked the question in a different thread to which I intended, since this map doesn't seem to be a redist.rar one so I can play it with no problems.

I mean, the question still stands - if there're any Mac users out there who know what I'm talking about, but this level (Subterranea) seems to be fine and I can play it no problems. Sorry for the confusion.

But while I'm here, I have to confess to being a bit stuck. I can get underneath the church and into the area above the trapdoor, but then I'm not sure what to do. I wondered whether I was supposed to look at the markings on the walls, but they don't seem very clear.