The MORPG(Multiplayer Online Role Playing Game) is one of the popular online game genre that its game play is more addictive and it has longer playing time compared with casual-style online game. This property makes it possible for game company to derive stable revenue for a long time other than casual- style online game. So far, developing MORPG has been popular on PC platform and now it has been started on a smart phone platform due to advances of hardware technologies and MORPG gives a new game experience to smartphone users. In order to make a new MORPG on smart phone platform, we have to design various use scenarios that are characterizing users’ behavioral actions in the game. It is time-consuming but we could save the design time if we reference to those of MORPG on PC platform. The paper proposes systematic user play scenarios for MORPGs on PC platform by characterizing 「Dungeon & Fighter」 and 「League of Legends」 which are the most popular MORPGs on PC, these days. We present the whole user scenarios with flowcharts showing the characteristics of all possible users’ actions in the MORPGs. When we make a new MORPG based on a smart phone platform, our results will provide with an effective design guideline for its game design.