It’s important to realize that the ADHD brain is motivated by interest and urgency, and not motivated by importance like a neurotypical brain is. So, that helps to make sense of the fact that he can hyperfocus on gaming. What @Robert said about “achieved levels, badges, wins in video games” is spot on too.
It’s completely reasonable to create daily routines, and then discuss how neither of you should do your “fun things” until the daily routine is complete. It can’t be your rule and it can’t feel parental, so be careful of that.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism