Cerberus no longer wants to serve Hades and guard the gates of the Underworld. He wants to become the Lord of the Underworld. With your skill and hunger for demon souls, I think we can make this happen. Cerberus will follow your mouse pointer and shoot automatically. So you need to make sure to avoid bullets from other demons and running directly into them. You can however crash right into rocks and they will explode and provide you with souls. You can use the souls to purchase upgrades to make Cerberus bigger, stronger and more agile of a killer.