How to get the key from rat

[Abayomi]

I´ve been playing for 6,5h and i dont know what to do any more

[Octo]

in order to get the key from the rat, you need to put thawed cheese in front of the mouse. first, get the frozen cheese from the freezer. after that, there's a bathroom next to the stairwell into bugleberry's room (which is to the right of the living room if you don't remember) that has a hair dryer in it. open up your stomach, and use the cheese on the hair dryer. go back, and use the cheese on the mouse hole.
hope this helps!