Locations of all the secret rooms

[Ginginc]

I believe I'm missing one room as I still have one gold & silver key leftover can anyone help?

Tower - Levitaton Magic
Teachers Room - Meta Magic
Sewers - Meta Magic
2nd Floor Hallway - Sleep Magic
West Dorm 2nd Flr - Sleep Magic
East Dorm Washing Room - Meta Magic

Need the location for the 7th room.

[StargazingOri]

Just walk under the stairs in the first floor's hallway.

[Ginginc]

Thx