Dude, I grew up on Nintendo. SNES, Nintendo 64, Gameboy Color, Gameboy Advance, Gameboy Advance SP, and Gamecube, I owned them all. I was just joking around because Nintendo has just been very child friendly, but I do know some very mature Nintendo games exist like Madworld.
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There was only one time Nintendo wanted no gore it was during sega vs Nintendo since than Nintendo has let gore happen. But blood and gore does not make a game "mature"