Yes.
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Buy E rated games instead of T or M rated games.
Its a mature game only for 17 and up
Portal 2 is a co-op game rated E10+
Depends on the parents opinion. The game is rated M for Mature, so you will not be able to buy it unless you are of age. ( age varies in different states)
That's tough. The way I managed to convince them was to show them a Teen rated game like Goldeneye, and then an M rated game like Halo, to show them that there isn't that much of a difference between the two.