This research was motivated by the low mastery of Japanese vocabulary among eleventh-grade students of TKR at SMKN 2 Pekanbaru, which indicated the need for interactive and enjoyable learning media to increase learning motivation. The purpose of this study was to determine the effectiveness of the Open the Box game in learning Japanese vocabulary. The research method used was a quantitative method with a pre-experimental one group pre-test-post-test design. The research sample consisted of 40 students of class XI TKR at SMKN 2 Pekanbaru. The research was conducted by giving a pretest before the treatment, then learning using the Open the Box game, and ending with a posttest. The data collection technique used a vocabulary test in the form of questions. The results showed that the average pretest score was 41.17 in the very low category and increased to 74.67 in the sufficient category in the posttest. There was an increase of 33.50 points. The hypothesis test results showed that there was a significant difference between the pretest and posttest scores. Thus, it can be concluded that the Open the Box game is effective in improving students' Japanese vocabulary ability.
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