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Hacker name - Mr.Moibe
Former experience -Programming (html, css, and learning c) and some penetration testing(kali)
Desired Specialty - Account harvesting and/or money making
Are you mature -...

The question, MY question is, does he have a skype? If so you may be able to dox him. I am by no way a genius in this field, and a swift google search on the topic will bring up lots o results. But...

I probably wont be able to help you, but as your post is right now, I think no one could. You didn't specify a game, just 'Multiplayer'. I assume if your game is old you probably could inject a .dll...