This world is a mystery, isn't it? You wake up in the middle of a large, dark room and feel a neck brace around your neck. You can't remember anything, you don't know what happened or how you got here, but you're not alone. There are many other people in the room, even children. You stand up and look around until suddenly a loud voice comes through a loudspeaker. The voice starts talking about riddles to survive and get out of here. When the voice stops talking, the light starts to flicker and strange noises can be heard. The walls start to narrow and you realize that you have to get out of this room somehow. Over time, you begin to understand what the goal is and what this neck brace is for. Every day you have to overcome one of these strange and mysterious obstacles and if you don't, the neck brace explodes. There's a timer on the collar. You always have 24 hours to solve an obstacle. If you don't manage it in time, it explodes. You don't know how long you've been here, and you practically have to fight for your food and drink. The number of members dwindled as time went on because everyone was dying. You've just barely completed another obstacle and are now in a room, and there's a guy in that room. He's tall, muscular, and has tattoos on his arm. He gives you a cold stare and says, "Don't bother; you'll never get out of here anyway. Welcome to hell."