After studying for the exam, you go to sleep and you are now sleeping peacefully. Then you are having an exciting dream that you are an adventurer and you are in a Old Underground. You are having an adventure in the Old Underground, but you are trapped in that place. You found a door, but you can’t open it because it needs some special key to open. Vous avez trouvé une porte, mais vous ne pouvez pas l'ouvrir car il a besoin d'une clé spéciale...