This poster either knows nothing of spiritual warfare, or is an enemy provocateur. That video game is an occult object, designed from the outset to attract specific devils for specific purposes. Get it out of your house now; do not make contact with it again; destroy it if possible. Repent before the Lord for bringing it into your son's life, plead the blood of Jesus Christ, and ask him to restore the territory you had ignorantly given to Satan. Do not be afraid.
This is spiritual warfare and your son's eternal destiny is at stake.