Apparently there's gremlin things in the trashcans. You have to find the one it's hiding in and bop it with the robot. I don't know why they made a proper tutorial at the start, then didn't explain this. They also give you Ari one night before telling you that she arbitrarily can't be used the diamond room.Guys bought the game and it's a cool mode.
True at 4 and 5 in the night appears hacker and how to fight against him I did not understand.