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Hidden Locations are certain locations that only appear in special events, such as a proposal. Otherwise, the said locations are completely inaccessible. The idea implies that the island's map screen may just be a simple view and the island is actually much larger than possibly known.
In some of the news stories, there is a hotel lobby. For an example, when the Mii population reaches a certain number, and a Mii's birthday comes, a few Miis will be seen partying at the apartment lobby. The apartment lobby also appears as a photo studio background.
The Bathouse appears whenever a Mii uses a bath set. It also appears as a common interior.
The Classroom, as the name implies, is a simple room found within a school building. In the American version, the room resembles an average American classroom: Desks lined up in front of a chalkboard with a computer and bookshelf behind them. In the Japanese version, it reuses its appearance from Tomodachi Collection: featuring cupboards and portraits in place of the desks and bookshelfs. The wallpaper is also different.
The Hotel is a hidden Location only appearing in Tomodachi Collection. It serves the same purpose as the Appartment Lobby in this game, being where Miis celebrate when their population reaches a certain number.
The Kitchen is an area where Miis cook using a frying pan. It also appears as an interior.
The office appears in the Age-o-matic montage along with the restaurant and the train station. It's also a common interior.
The restaurant appears as both a place where a Mii can propose and a location shown in the Age-o-matic montage, along with the office and the train station. It may be part of the Observation Tower, in the area surrounded with glass. The Restaurant is also the monthly interior for February, though it appears much more compressed.
The train station is briefly shown in the first part of the Age-o-matic with the Mii walking along the platform, and catching a train. It is also shown when one Mii tries to propose to his/her Sweetheart, and one Mii trying to set up a friend with a potential romantic suitor. The train station can also be mentioned in passing durring a Guys'/Gals' Hangout
The Wedding area appears durring a Marriage between two miis. It also appears as the monthly interior for June.