This game is fucking terrifying. Especially on launch, where you had no clue how the AI worked. I remember being stuck in a room for at least 10 minutes out of fear, since I kept hearing it shuffle about in the darkness but couldn't tell exactly where it was in the maze of halls. Easily the scariest Amnesia game and up there for one of the best horror games overall.

Then they added Nightmare mode later and I literally could not continue the game from how scary it was.