ANDRIANI: The Use of Jeopardy Game to Increase Students’ VocabularyMastery at SMP Negeri 1 Balla. Thesis, Majene: Faculty of Teacher Training and Education, University of Sulawesi Barat, 2025. This study aims to determine the effectiveness of using the Jeopardy game in improving students’ vocabulary mastery and to analyze students’ perceptions of this method. This quantitative research employed an experimental design with a pre-test and post-test approach in both the control and treatment classes at SMP Negeri 1 Balla. The research subjects consisted of 21 students from class VII A (experimental class) and 21 students from class VII B (control class), selected using a purposive sampling technique. Data were collected through tests, including a pre-test and a post-test to measure students’ vocabulary improvement, and a questionnaire to obtain information about students’ perceptions after using the Jeopardy game. The results of the study showed a significant increase in students' vocabulary mastery in the experimental class using the Jeopardy game. The average post-test score for the experimental class was 77.14, significantly higher than the score for the control class, which only reached 60.24. From these
results, it can be concluded that H1 is acceptable. Furthermore, the questionnaire results were also very positive, with an average score of 88.94, which was considered to be able to improving their vocabulary mastery, helping them understand vocabulary more easily, and increasing their motivation in learning.