The information-classification(rule) of library is applied for the convenience of library user and manager, and it is a means of supporting library user to access accurately similar information resources or quickly to the desired information resource. The library information classification (rule) is an important and necessary basic knowledge for improving information processing abilities, such as searching, using, and locating information in libraries and academic institutions, thus, library user in order to meet the information needs and collect the correct information, it is necessary to understand the information organization system and establish a basic concept. Education related to these is provided by several institutions such as schools and libraries et all., but it has not yet been activated. Therefore, in this study, as a way to improve library users’ ability to organize and classify information resources and to revitalize classification education, we developed a digital game ‘Classify Game’ by using classification rule(KDC) and gamification. In addition, in order to examine viewpoint of game user to information-classification(rule) and classification-related games, a pre-game perception survey and a post-game opinion survey were conducted.