If the player wishes to start here, they must enter the password for the last Road War, rather than the final arena battle. If the player enters the password for the final arena battle, the player will not have enough crossbow ammo to kill the final boss, even if every single one hits him.
If the player wants to begin here, they need to input the password from the previous Road War instead of the final arena battle. If the player inputs the final arena battle's password, they won't have enough crossbow ammo to defeat the final boss, even if all shots hit him.