I seem to be the only one needing help with this hold! Well, so be it. I'm stuck in a logic loop with this room, the last one I need to complete to drop the blue door.
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×1. There are 4 serpents, each in its own cubicle which it won't leave. (I've tried hitting the final orb at various times and points in the routes, and it seems nothing induces them to leave their 2x2 squares.
2. Therefore they must be killed by a monster entering their cubicle and blocking them.
3. So I need 4 such monsters, as the way out is blocked (until I enter the final area, at which point I can't lead monsters back in to kill another).
4. All I have to work with is the goblin and one tar baby (created on the third growth of tar). If I wait for another spawning, a tar baby will be created in the NE square that I can never reach.
5. So I can kill only 2 of the snakes. I had hoped that after I open the exit gates, the remaining serpents would head toward me down the corridors and die from finding their way blocked, but as suggested in #1, they don't.
I feel as if I'm very close. Which of my statements is wrong? (Or some other minimal hint.) I've really been enjoying this hold, and for that matter this room is fun to figure out but my brain seems to have shut down.