\A gamer who plays a variety of video games, based only on gameplay, not graphics, story, popularity,etc. They respect the old school, and own multiple consoles, old and new(not a fanboy.) They enjoy playing FPS's, JRPGS, Fighting games, etc. The term also applies to PC gamers.
You are not a hardcore gamer cause you play casual shooters, MLG isn't hardcore, playing ONE game isnt hardcore.