Girl, you need to take authority over that demonic Spirit that has him bound to that game! This is how you do it.
Father, I come to you in the name of Jesus and because your word says to cast all our care on you because you care for us. i'm not going to worry about this situation any longer, but I am going to take action according to your word that says Christ has given me authority to trample on snakes and scorpions and to overcome ALL the power the enemy posesses and nothing shal by ANY means harm me!
So, In the name of Jesus, I plead the blood of jesus over my son right now! I see you devil that has him addicted to this game! I recognize you as a blinding spirit! I take authority over you in the name of jesus and I say to you to CEASE and DESIST in your workings right now! You take your hands off of my son, I bind you from clouding his mind and nearing him in any way. I take authority over his computer and command angels right now to dispatch to my son and war for him with flaming swords. This game will never hold my son again!"
then start praising the lord for victory and expect a call in the next few days. Let the spirit of God lead you and speak in tongues over him. Anoint a "snail-mail" letter and send it to him. But don't let the devil defeat you opne more day about it! you are an overcomer!
You can do it, in Jesus' name!