Japanese RPG (FF, DQ, SO, etc.)
Western RPG (Mass Effect, WoW, most MMOs)
Strategy RPG (Disgaea, Valkyrie of the Battlefield)
Action RPG (not sure how these would be differentiated from JRPGs like FFXII, Dark Cloud, or White Knight Story, basically more action oriented rather than turn based JRPGs)
^That's the best I can do. Also, don't trust my definition of ARPG.







