Mathematics is a universal science that is useful for human life and also underpins the development of modern technology. In general, students find it difficult to learn mathematics due to its abstract nature, which leads to low learning interest. Therefore, contextual learning that is closely related to their daily lives is needed, one of which is ethnomathematics learning. Ethnomathematics learning is integrated with educational games to further increase the appeal of mathematics learning. This study aims to measure the validity, practicality, and effectiveness of the developed educational game. The research uses the 4D model, which includes define, design, development, and disseminate stages. The practicality test was conducted by distributing questionnaires to teachers and students. Meanwhile, the effectiveness test was carried out by giving questionnaires to observers and reviewing students' learning outcomes. The results showed that the developed media was highly valid, with a percentage of 86.7% for the material and 94% for the media; very practical, with teacher and student response percentages of 94.7% and 86.2% respectively; and effective, with an observation result percentage of 91.7%. The learning outcome test showed that 74.28% of students met the Minimum Mastery Criteria. Therefore, the Lagia traditional musical instrument-based educational game is suitable for use in mathematics learning
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