Which is only accessible via a secret passage in 3N.
×And this secret passage can only be breached with a sword pointed West, which is not a direction that can be reached without considerable strategy and having completed the rest of the level including at least one room that doesn't technically require completion.
Click here to view the secret text
×Fortunately only one room in this central part of the level contains any monsters, and it's marked "secret", therefore is not necessary for dropping the blue doors... that would be evil, if BOTH parts of the level were necessary for the blue doors, wouldn't it?