I think my father and stepmother divorced because of me and a Nintendo.
Why would you think Nintendo would be involved in your parents' breakup?
I became addicted to the game and my mom got angry with me over that.
I think it's highly unlikely your parents divorced due to your game addiction. Don't take the blame for their failed marriage.
I know it's not my fault but my parents never let me forget it.
You need to stop blaming yourself. You did nothing wrong, and it is wrong for your parents to imply otherwise.