What qualifies as a "mature" game?

[NintendoPie]

F0X said:

I agree, so it's time to switch directions. Mature content directed at a mature audience counts as a mature game. I won't doubt that. However, as I was just saying there are games like Metroid that aren't M-rated, but are directed at a mature audience (well, that's what Reggie said at E3 2010). What do you make of this? Can a game that isn't M-rated exist solely to appease an older audience? Moreover, does a game have to have M-rated content to appeal solely to an older audience?

Yes.

No.