Map drawn on a note/scroll (lvl 4?)

[Lmaoboat]

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

SpoilerShow

Go up to that big loop near the top, a wall opened up when spiders came out to ambush you.

[Ugm]

No, you didn't. You haven't found secret rectangular room, which is shown on the map on the scroll mentioned.

SpoilerShow

It has another secret switch which opens passage to section of level 4 with slimes.

[Kyosho]

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