No one is the McM. That is the secret block you have to press in the library to enter the secret library "basement."
You can,t
First press the metal plate that says McM on it then stairs come go down.Then you'll find the moldy cheese!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
U have to first get to the library in the castle and press on the McM shelf. Once u get there u will see moldy cheese, pick it up and go to where the mouse is, click use and the mouse will be captured.
It is in the library. Go to the Non - Fiction books (Go down the path of stairs you see when you enter) and look for a small golden plate that says "McM". Click on the plate and a secret passage will open. Go inside
run
you do nothing
The Black Widow has it
Hop on other things to get higher
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in srink ray ilond at c.j's house
mcm
what is mcm corce