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MUTIAH. NIM: 2319151, The Effect of Using Crossword Puzzle Towards Students' Vocabulary Mastery at The Eighth Grade Students of SMPN 2 Dua Koto. A thesis, state of Islamic university bukittinggi 2025. Vocabulary mastery plays a crucial role in students’ ability to communicate effectively in English. However, many students face difficulties in learning and retaining new vocabulary, which hinders their language proficiency. This research was conducted to address the problem of students’ limited vocabulary mastery and to explore the effectiveness of using crossword puzzles as a learning tool. The study aimed to determine whether the use of crossword puzzles significantly impacts students’ vocabulary acquisition at the eighth grade of SMPN 2 Dua Koto. This study employed a quantitative experimental research method with a pre-test and post-test design. The participants consisted of 24 eighth-grade students who were given vocabulary tests before and after the implementation of crossword puzzles in their learning process. The data were analyzed using paired sample t-test to measure the significance of the improvement in students' vocabulary mastery. The findings revealed a significant improvement in students' vocabulary scores after the application of crossword puzzles. The statistical analysis showed that the post-test scores were significantly higher than the pre-test scores, indicating that crossword puzzles effectively enhanced vocabulary learning. Additionally, students demonstrated increased motivation and engagement during the learning process. Based on these results, it can be concluded that crossword puzzles are an effective tool for improving vocabulary mastery among junior high school students. It is recommended that teachers incorporate this method into their instructional strategies to create a more interactive and engaging learning environment