<![CDATA[Vocabulary is a fundamental component of English language proficiency, supporting the development of listening, speaking, reading, and writing skills. Crossword puzzle games have been used in English as a Foreign Language (EFL) classrooms to support vocabulary learning, yet their theoretical foundations and pedagogical mechanisms require further synthesis. This study aims to review the literature on the use of crossword puzzle games in vocabulary instruction, focusing on their theoretical foundations, learning mechanisms, and implications for vocabulary learning outcomes. Using a library research design, this study examined ten scholarly sources comprising books, journal articles, and an undergraduate thesis. The thesis was included as supplementary literature to broaden the discussion of classroom applications, while the findings were interpreted in relation to the available evidence. The reviewed literature suggests that crossword puzzle games are associated with constructivist learning, social interaction, and game-based learning principles. Their potential contributions to vocabulary learning include active word retrieval, repeated engagement with vocabulary, contextual reasoning, motivation, and peer collaboration. However, the strength of the reported benefits may vary depending on instructional design, learner characteristics, and classroom implementation. This review suggests that crossword puzzle games can serve as a supplementary strategy for EFL vocabulary instruction, although further systematic research is needed to establish the consistency and strength of their effects.]]>
