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Abstract This research discussed about the implementation of crossword puzzle in teaching vocabulary. The aimed in this research were to find out the effectiveness of using crossword puzzle of part of speech to improve the vocabulary of the eighth grade students at SMPN 2 Watansoppeng. The variables of this research were crossword puzzle game as an independent variable and vocabulary as a dependent variable. The method used in this research was quasi experimental research. Then, there were two classes used in this research;grade VIII 2 as an experimental class and grade VIII 3 as a control class. The total population of this research was 140 students taken from the eighth grade students of SMPN 2 Watansoppeng. The total sample of this research was 40 students. The samples were chosen purposively, consist of 20 students from each class VIII 2 and VIII 3. The researcher employed crossword puzzle game consisted of 20 clues as the instrument of data collection.The instrument used in this research to collect data was test consist of pre-test and post-test. The researcher found that there was difference between the students- score in pre-test and post-test. It was proved by the mean score in pre-test which was higher than the mean score in the post-test. In experimental class, the mean score of pre-test was 57 (fair) and the mean score of post-test was 84 (very good). While in control class, the mean score of pre-test was 51 (fair) and the mean score of post-test was 75 (good). While, both of the classes were improved, the significant improvement happened in experimental class from fair to very good score. Besides, in control class the improvement was only from fair to good score. In addition, the t-test value (3.68) was higher than t-table value (2.048). Based on the result of analysis, the researcher concluded that the implementation of Crossword Puzzle Game effective to enhance the students skill in word classes and vocabulary mastery in the eighth year students of SMPN 2 Watansoppeng in academic year 2018/2019.