The research aims to produce a product media of educational game “Monopoli Fisika Asik (MOSIK)”on science subjects in junior high school. Media of educational game “Monopoli Fisika Asik (MOSIK)” is a medium of learning based educational game is monopoly which had elements of education and can be used in study of fun and interesting. The design development used in this research is the development model's 4-D according to Thiagarajan. The population of this research were students of class VIII-A at SMPN 1 Kalibaru.Technique to collect the data were documentation, observation, questionnaire, and test. Based on the result of the study showed that media educational game “MOSIK” fit for use as a medium of learning science with valid category of 4,02. Student learning interest is very high at 92,1 % with categories of excellent. Student learning activity showed activity very high is 92,95 % and completeness of student learning outcomes at 85.71% with an average post-test 87.57.