This study is aimed to develop monopoly game that is combined with snakes-ladders game as teaching media to teach grammar for the eighth-grade students at SMPN 1 Pule. It is important to be conducted there since students were not highly motivated in learning grammar. One of the reasons for that is that an interactive and fun learning media is not available yet. Both students and teachers need that media that is known after need analysis in preliminary research was conducted. This study is conducted to provide a learning media for grammar mastery. Research and Development (R&D) design is used in this study. R&D is a type of research that focuses on creating and validating educational goods. In this research, it is focused on teaching media. Questionnaire, interview and observation are also used as research instruments to obtain the data in this study. The result of this study is provided. Problem identification result reveals that both grammar and media were essential for students and teachers. Interesting media that can be used within group learning was needed. Result of revising the product shows that there are three things to revise. Those are to extend the length of track, to add longer snakes and ladders, and to make cards in the same colors. Field testing or tryout of product result reveals Grampolers is an acceptable learning media for grammar mastery for eighth-grade students at SMPN 1 Pule after two tryouts. Publishing the product result reports that Grampolers, a set of learning media for grammar mastery, was the ultimate result and it is distributed to SMPN 1 Pule. The conclusion is that Grampolers is a set of learning media for grammar mastery for eighth-grade students at SMPN 1 Pule in Trenggalek. It consists of one board game, forty-seven cards, one dice, four pawns, and one answer key. It can also increase students’ motivation in learning grammar. Practical and affordable media is the strength of Grampolers. It can be played without teachers’ assistance. There are some recommendations for teachers, school administrators, and further researcher. For teachers, it is suggested to explain the rules of Grampolers before using it. For school administrators, Grampolers can also be provided for the teachers since it can be alternative media in learning English. For further researchers, Grampolers is suggested to extend the track so that it can be used for more than twenty-five minutes. It can also be developed for seventh- and ninth- grade of junior high school. If it is possible, it can be developed for other education level such as elementary school and senior high school.