People play games for different reasons at different times. Richard Bartle was one of the first to present a coherent theory about this - the bartle test. Another researcher, Nick Yee questioned Bartles findings in his daedalus project. Bartle initially started with 4 player types below: Achievers Explorers Socializers Killers Bartle increased his graph to 8 types. He discusses these types at length in this article on his website : source for above content. Nick Yee had a different perspective than Bartle, and presented the following reasons play mmorpg's source) : I think people probably are generally one specific player type, but drift into other types as they play.