I don't see anyone else here have mentioned it, but, I heard from people in #TF today that the exit of terra4 is b0rked on normal skill. (It's b0rked on easy skill too, but you can still exit the level there.)

At the exit, it's supposed to spawn three monsters on hard, two monsters on normal and one on easy.
As it is now, it spawns three on hard, one on normal and two on easy. This makes the trigger_counter on normal skill unable to open the exit because there's only one monster where it requires two, and on easy skill it opens after you've only killed one monster.

Well well. Shit happens. Sorry if anyone got stuck there on normal, nothing I can do about that now, just noclip down to the exit please. As I've said not a whole lot of testing has gone into these maps, and the testing that has been has mostly been on easy and hard skill, because one assumes that if easy is ok, and hard is ok, anything inbetween is ok too!

Anyway, I suck immensely and I grant you permission to photoshop genitalia onto my face if that should make you feel any better.