Grimrock

Wow how did I miss that room? Thanks guys, I found it. Much appreciated.

I don't see it. Did I already find it? Is that the problem? Here's my map:

I tried looking for part of the map that fits the configuration, on level 3, but nothing does. At least, not that I can tell. Here's a screencap of the note (it does have a slime):

Ahhh conflicting answers! Anyone else?

I think I picked it up on level 4, anyway. But yeah, there's a hand-drawn portion of a map with a square room, and a symbol above one of the corners. I think the symbol is the same one that's above most of the doors. I looked at the map and didn't see a room that fit the drawing exactly (as far as l...