despite hearing the strange noises, you open door 50. As soon as you do, you see a nearly 8 ft tall creature with only a mouth and no eyes. It steps out from behind the bookshelf, and sprints across the library in seconds. You crouch down, and walk over to a desk. You find a piece of paper, it says to find five books with a shape in them the number the shape stands for will also be on the page. Once you have the full code, you get the lock at the end of the library off the door.