<![CDATA[Vocabulary mastery is one of the fundamental components in language learning, especially for English as a Foreign Language at the elementary level. This study aims to develop a learning medium in the form of a crossword puzzle combined with clue cards to improve vocabulary mastery among fourth-grade students. The research employed a Research and Development (R&D) approach using the ADDIE development model, consisting of Analysis, Design, Development, Implementation, and Evaluation. The product was designed based on students' needs, aligned with the curriculum, and validated by media and content experts. The product was tested on 27 fourth-grade students at SDN 03 Sidigede, Jepara, using a pre-experimental design with a one-group pre-test and post-test model. The paired sample t-test showed a significant increase in students’ vocabulary scores after using the media, with an average improvement of 30.44 points (p < 0.001). Additionally, feedback from both teachers and students indicated that the crossword puzzle and clue cards were highly engaging, easy to use, and effective. Expert validation confirmed the media's feasibility, with a 97.5% appropriateness rating from content and language experts, and 87.75% from media experts. In conclusion, the developed crossword puzzle media proved to be an effective and feasible tool for enhancing vocabulary mastery. Its interactive and game-based format successfully increased students’ motivation, participation, and long-term retention of vocabulary in the English learning process.]]>
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