You open the door and begin to cross the threshold into the dark room in front of you. As you place your foot down in the next room, you realize there's no floor. Your momentum pushes you forward as you try to pull your foot back. You lose your balance and stumble to the floor below. Above you, you hear the familiar sound of a door slamming shut. You grimace in pain and start to feel around in the dark for someway out. Your hands pass over something slimy, and you recoil in disgust. You back into a door handle and realize this is your only way out. Pulling open the door, you enter yet another dark room.