This research investigates on relationships between game experience and its positive effects by using social self-efficacy measurement. When playing MMORPG, game users communicate with each other and go through various social experiences. Thus, online game offer a virtual place where we can have social interactions and it eventually expands our daily life. In this study, we used regression analysis to explore how online game experiences influence social self-efficacy. The results indicated that a group with higher frequency game use presented higher social self-efficacy. We suggest future researches and discussions focusing on the positive effects of game use rather than negative issues and game restrictions.