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imo

there are games that are just made for entertainment where you don't need skills(casual games)

and there are games that have to be "beaten"or "solved" ,where you need to show physical,optical,concentration and other skills when you are eg under pressure.(core games)
hardcoregames are either the masochist Version of core games(eg. some japanese shootemups) because of an inhuman skill
or usual games could be turned into hardcore games by a gamer,eg when you compete with others(eg. pinball games are for sure not hardcore ,but as soon as you try to become world wide no.1 on a pinball game,you will realize it is really hardcore(with the time i invested in this i would have beaten almost all hardcore games ,except mushihimezama)