Castle Tunnel Princess Escape

There was once a time when magicians were as common as cars in our world. They were divided into those who prefer a light magic, and those who have served the evil and used dark magic. This is the dark mage attacked the castle of our main character. He killed the king and queen, but the princess has managed to escape and hid in the tunnel under the castle. She is the only heir to the throne. Help her to get out of this place.