Floor 3 of episode 4 played blind on expert difficulty. Obviously it's the chambers that are circular, not the aliens. I'm very low on ammo through some of this and have to use the weak default pistol a lot as it requires no ammo. It's never a good idea to let the energy rifles run out of ammo as they are the only weapons that can destroy the machine gun turrets. You could feasibly get stuck in this game if you had no way to take out the turrets, especially if you were low on health. Fortunately there were just enough hidden health and ammo caches to keep me going.
Note - Occasional choppiness is due to the bstone source port. It has a better control scheme than the DOS version which is why I'm using it but can vary in performance and gets choppy when turning and strafing, presumably because the original game wasn't designed for that.
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