You begin in an empty office room with windows and a giant radiator to your right, and a slightly frosted glass window to your left. Well, window slash wall. It's one of those offices where you're not supposed to avoid being looked at by coworkers, I guess. Move towards the door and out into the hallway. If you look to your left, you will see somebody walking into an office down the hall, but you're going to the right. Continue down the hall, past the first major intersection, and into the room immediately to the right after that intersection. You should step into that door's threshold and then take one more step inside. If you look back, this is room number 335, and once you are in there you are done.