Halliday smiled, then gestured around us. "This is your castle now. I’ve coded this room so that only your avatar can enter it. I did this to ensure that you alone have access to this." He walked over to a bookshelf against the wall and pulled on the spine of one of the volumes it held. I heard a click; then the bookshelf slid aside, revealing a square metal plate set into the wall. In the center of the plate there was a comically large red button embossed with a single word: OFF .