If you said E, E10, or AO, than you need to do some more research on the game!
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Why does anyone care? Most of the annoying kids would have gotten no matter what the rating is. In fact, I would be willing to bet some of the annoying kids will only buy a game if it is rated m. Most of the kids who wouldn't have gotten it if it was rated m are probably well behaved enough that they wouldn't be annoying to play with anyways.