<![CDATA[Mastering vocabulary is essential for successful language learning 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 examine the effectiveness of crossword puzzles in language learning as a learning tool. The study aimed to determine whether the use of crossword puzzles significantly affects the vocabulary development of Grade VIII learners at SMPN 2 Dua Koto. This study applied a quantitative approach using pre-test and post-test procedures. The participants of this study were 24 eighth‑grade students who completed vocabulary tests administered before and after the use of crossword puzzles in their lessons. The collected data were examined through a paired sample t‑test to determine the statistical significance of the improvement in vocabulary mastery. The result of paired sample t-test showed a significant efect (t-obtained 17.158 > t-table 2.500 with df 23 and p<0,0001.) The results showed a notable increase in students’ vocabulary scores following the integration of crossword puzzles. Post‑test outcomes were considerably higher than pre‑test scores, confirming that crossword puzzles contributed positively to vocabulary learning. In addition, learners displayed greater motivation and active involvement during the instructional process. These findings suggest that crossword puzzles can be considered an effective strategy for enhancing 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.]]>
