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Hmmm, it's been too long since I last played to know exactly what to do. That's a really tricky dungeon. Was the walkthrough (not mine, the other one) not helpful? You need to collect green tubes to place in a panel, and then floor 13 will be drained. I suggest going through the floors you've been to before because as you find and complete stuff, new parts open up all over the place. It's a very confusing dungeon, so expect to do a lot of back and forth exploring.
"I am sexy minority. OH! NO! I wanna be a sexy terminator. Sexy will never die. AH~~~~~!"