I'm going to ask my roommate to turn his games off at night
Why do you need to ask him that?
I need to do homework at night and all of the noise and commotion is distracting.
If I were you, then definitely I would ask them as well to turn down their volume or better they can just wear a headset. You should consider the feelings and the well being of your roommates or anyone that you are living with, and I hope that you talked to him making sure that he understands that what he's doing is rude and disruptive.
I'm trying to be positive but he doesn't understand. Still going to ask him, probably through our chat.
That's a very mature way to handle it. Just approach them in a friendly and understanding manner. Try to not to escalate the situation and I'm sure your roommate will be more considerate of you in the future.