There is no true way to convince your parents to buy you the game. However, you can always show them you are responsible to handle the game content. I would sit down with your parents and talk to them about their concerns with the game.
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you dont have to convince my parents i am a big boy if i want it i could go and get it anytime i want to. believe me dude, you dont gotta convince my parents, i dont want that stupid game anyway i would much rather play some NHL '94
Largely, it depends on the standing of the parents on whether or not their 9 year old should play Call of Duty or not. It should also be noted that the modern Call of Duty series is rated "M" for Mature 17+. This rating is not posted on the original Call of Duty, Call of Duty 2, Call of Duty: United Offensive, or Call of Duty 3 - in which are rated "T" for Teens.
Tell her that you will be learning about the history of the cold war! and that the people in it are actually just robots.
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