In Silent Hill 3, Heather Mason finds a briefcase that must be opened in order to progress. The briefcase is found in room M4 of Brookhaven Hospital and contains an instant camera Heather must later use. The puzzle involves a four-digit numerical lock on the briefcase that can be opened using a nearby clue. As soon as Heather enters the room, an alarm clock sounds, directing attention to it. The clock is the clue that must be deciphered to obtain the number needed.