I’m near the end, and I followed the walkthrough for the most part.
But it instructed me to leave the arsenal, go OUT E U W W Wait and then X tumbler on the door. But there are no tumblers and no door. Earlier, when I first arrived, it suggested I WAIT to figure out how long a patrol takes, but doing so right then does nothing, and doing it here does nothing. If I try going up the stairs, the patrol sees me and grabs me. I suspect I must WAIT somewhere to figure out the patrol pattern, but I don’t know how.
Any suggestions?
Edit: Somehow, I got it to work by going back into the room I originally came from, making my light dispel, then going back out and WAITing again.