In the case of casual games, where many small and medium developers are conducting global services, game services are becoming more advanced and competition is intensifying in major emerging game markets such as Japan, Taiwan, and Southeast Asia. Even if the company succeeds in attracting customers through high marketing costs, it is difficult for users to continue their game continuity with game contents that are not localized. It is very important to establish an in-game operating system to help users settle in the game, while judging by the current game marketing trend, where new game downloads are decreasing. In this study, we organized successful localization of casual games through overseas localization cases of mobile game Disney Wrong Picture Finding from Lunosoft and studied stable localization methods through empirical examples for successful global services of mobile games.