Floor 7 of episode 4 played blind on expert difficulty. There are three locked doors and a teleporter when you first exit the elevator on this floor, time to hunt for those keys. I still didn't realise that blowing up tanks counts towards enemies destroyed at this point, so could have got my percentage higher had I done.
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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