The windows are covered.
The doors lead to dark rooms.
You have many choices, but no choice in the matter.
The place is unfamiliar, yet familiar at the same time.
You know what will and can happen, and what wont.
You've been down this road before. The monsters await your arrival,
But you are the monster. You can't remember what you've done, But know what you caused. You feel sick to your stomach, or are you sick in the head. Then you realize, that's where you are...
In your head.

You don't know where these halls will lead to, which death, torturer or nightmare. But you know this, You caused this. Your choices have lead to this, these moments. To the "Flashes" and Nightmares.

Or did I really have a choice in the matter at all?
I guess in the End, It will all fit together.