Teen video game addiction- any turn around success stories?

I know many people have screen time rules and their kids are good about managing their time with some or even little supervision. But, respectfully not asking about that because it's pretty simple and obvious to manage the time of a 12 yr old.Wondering about when things have gone off the rails, then what?A family member is dealing with this currently where the teen went from an A student to a D average in 2 years and is fully addicted to games. Started with Mine Craft when younger and progressed. Now it's games with friends, none of whom they've actually met.The child, now a teenager, will sneak and get up in the middle of the night to play so they are exhausted the next day. This leads to more missed days of school...spent playing games. They've gained weight and are self-conscious about it, and seem to love the games and talking with their friends on the headset but overall still feel down generally if that makes sense. Some of the "friends" are also much older and the teen started swearing and being very rude at times.The adult in this situation has taken the computer away at times but it leads to swearing, yelling and chaos. The adult is stressed and not capable of enforcing any screen limit rules it seems.My advice was to completely cut off the games since arguing about screen time limits is too chaotic. But, the family member says these people online are the teen's biggest social outlet. They talk on the phone about life, etc when not gaming. Some of them are good kids from what I'm told, but doesn't seem worth the cost. As an analogy, I say if you put ice cream in front of the kid, it'll get eaten. But if you rid the house of ice cream the teen will adapt to better habits.The teen can't fully see it but doors of opportunity on what they wanted to do in life are closing- at least the easy way. There's always community college and never too late but you know what I mean. The child has quit games on their own at times to focus on school but "can't stay away" in their words.Anyone out there successfully bring a teen back from the brink? Would be interesting to hear. via /r/Parenting http://ift.tt/2gXT5Jt