"1999 Mode, Part 12/13: Chapters 34—36"—This is the highest difficulty under which the game can be played. The mode is hidden by default, but appears as an option either once a player finishes the game or enters the infamous Konami Code at any point in the game (up, up, down, down, left, right, left, right, o, x, start). This gamechive—and the ones that preceded and follow—showcase an entire playthrough under this increased difficulty. Though collectibles are picked up along the way, not every area is explored in detail, as it's similar to a speedrun. For a complete exploratory experience, chapter by chapter, see the following playthrough: https://youtu.be/HcGrOqVL434.
This segment covers the following chapters, and collectibles found within:
Chapter 34: Warden's Office
- Voxophone (75/80): Ending It (On elevator floor.)
Chapter 35: The Operating Theater
Locked Door (In between the two machine entrances.) (36/42) (3 lockpicks req.)
- Infusion (30/30) (On desk.)
- Voxophone (76/80): Pavlov's Bell (On desk.)
Locked Door (Exit to elevator.) (37/42) (1 lockpick req.)
Chapter 36: The Hand of the Prophet
- Locked Door (Exit to roof.) (38/42) (1 lockpick req.)
- Telescope (37/37) (On rooftop before exiting area via airship.)
Locked Door (Side of building before existing area via airship.) (39/42) (3 lockpicks req.)
- Voxophone (77/80): An Ultimatum (On floor, in between desks.)
- Safe (13/13) (1 lockpick req.) (Between cabinets.) = 187 Silver Eagles
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