You're hired! Your job is to separate residents from doppelgangers. Your room is an office at the entrance, only if you decide who will enter. Don't make a mistake, call the D.D.D. (3312) if there's a doppelganger. Doppelgangers are insistent about you opening the door.

The current person slams his hand against the window after you kept asking ,trying to see if it's a doppelganger or not, suddenly being very close. "Damnit. Everything checks out so let me inside the building."