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Although many Nintendo games have a cartoony appearence that may attract younger gamers, the games themselves offer quite a challenge. They appeal to all ages. I'm 23, I love the look of Nintendo's games. I play games to escape from reality once in a while, and I think that these games offer a great place to escape to. Do you honestly know many 5 year olds that have gathered all 120 stars in Mario64, without help from a guide? Or that has actually collected all 150 Pokemon on the Gameboy games?
These games offer a large challenge.
If you don't like this type of game, then there's always the Perfect Dark style games.
You are free to have you're own opinion on this, but at least dismiss it with some proper argument. Otherwise I'll just get bored.