Hello! Thanks for leaving a comment ^^
Can you tell what exactly happens after you fail to deliver the letters?
I delivered all the letters on the first floor. On the second floor, I learned that it's my apartment, an empty apartment, and Mrs. Bell's apartment. I didn't deliver any letters on that floor. Then I went to talk to Mrs. Bell. I hit spacebar, but she didn't say anything, and I couldn't move past her. Nothing happens after that.