<![CDATA[This research aims to determine the effectiveness of the crossword puzzle in increasing the vocabulary of Grade XI students at SMAN 1 Ampibabo. The research employed a quantitative approach using a quasi-experimental design, involving two classes: one experimental class taught using crossword puzzles and one control class taught without using crossword puzzles. The research instrument consisted of a pre-test and post-test vocabulary assessments, each comprising 30 multiple-choice questions that focused on concrete nouns and action verbs. The data were analysed using SPSS version 25, employing descriptive statistics, normality tests, homogeneity tests, and the Mann-Whitney U test. The results showed that the experimental class achieved a significant increase in vocabulary acquisition compared to the control class. The use of the crossword puzzles effectively increased students’ comprehension, spelling, and contextual use of new words. This research concludes that crossword puzzles can be an engaging and interactive medium for enriching students’ vocabulary learning in senior high school.]]>
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