Didn't help much. Seems like "visibility calculations" could take weeks. I tried building as map entities and converting to models, as I read that models are much faster... but the model turns out all screwed up, can walk through some parts and other blocks in the wrong places and texture turned black.

Any ideas? Beginning to wish I had simply gone with modding some game, but I figured this would be more flexible... instead it's giving me nothing but a headache. Starting to look like I'm screwed... have to cancel the exhibition... all I wanted was to make a very simple game. Man, my old Quake 2 maps was not very much simpler.

Sorry to be slagging off GS like this, I'm sure it's a good tool once you learn all the secrets that aren't in the tutorials. I'm just getting really depressed by all this failure. And the deadline is way too close.