Looping Hallway

The Looping Hallway is a puzzle that you are confronted with immediately after the Library Puzzle. At first, it doesn't seem like a puzzle at all, but as you continue to walk the corridors after the library, you gradually realize that you're walking around in circles — all the while being slowed by smoke in your struggle to find the exit. With each circuit, you see that the environment changes slightly. You can find your way out only by going backwards at a certain point.