We already have adventure legends that includes
Adventures, Adventure-Related, Kids, Adult, Role-Playing Games, Platformer and Casual Games: all sub genres with some adventure-ish elements
And shooter legends that includes First Person Shooters, Third Person Shooters, Free Fan-Made Games, Simulations and Shoot Em Ups, all games with shooting elements.
I don't see the urge to create a gazillion of subsites and or subsections: the existing search function is your friend dude!