Glad you've been enjoying the quest! Here's some pointers:
Spoiler
[spoiler]There are 3 rooms where all the mushrooms are the same color. I assume you've done what you needed to with the rooms with the green and blue mushrooms.
On the second floor from the bottom (B3, I think), there is a section to the left that contains the room with the red mushrooms and also requires at least 2 keys to access. You should be able to work your way over to it using your maps.
Will post a screenshot of my map if you're still stuck.
[/spo
Thanks Joelmacool and Maistygian. It ended up being the mechanic that Jeolmacool mentioned that did the trick..I do not know how I missed that mechanic.
Edited by jwex001, 07 October 2022 - 02:18 PM.