Affecting Real-Life Sanity

[DamnNoHtml]

another idea would be, that you get something like 'flashbacks' which shows you the room, in which you're currently running around, in his evil variation. For example at first, room is nice (flowers, nothing broken) then suddenly you get some screen effects (like flashback) and then, the whole room is filled with destroyed stuff and corpses

That's not really real-life sanity though. You would know that it is a simple scripted event.

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Im using a pretty spooky script in my custom story, its kind of like your original idea with the doors, but its with statues.

1. The player Enters a room with statues on the far wall, use lighting effects to make them subtly noticeable
2. The player looks away and the statues get a bit closer to you
3. If you are really clever (or if its even possible) make them slowly move closer to your coordinates everytime you glance away.

EDIT: its not like your original post, i just reread it

This is more along the lines of what I am talking about. The statues shouldn't have any big end-scare...just move slightly closer so the player has to question himself with "...did that move or not."