The Effectiveness of Using Hidden Word Game to Improve Vocabulary Mastery of the Seventh Grade Students of SMPN I Munjungan

Key words: Hidden Word Game, Vocabulary Mastery, The Seventh Grade Students English is an important to study, because it is an internatioanal language. To learn english students need vocabulary, bedause there will be no speaking, writing, reading, and listening without vocabulary, so the students should master vocabulary when they want to success in learning English. There are many media to teach vocabulary. The teacher usually teaches vocabulary by using memorizing vocabulary, opening the dictionary and etc. So the students get bored. Game is one of media to teach vocabulary. Hidden Word Game is a media which make the students enjoyable and comfortable to study vocabulary. The research problems are: 1) how is the students’ vocabulary achievement before they were taught by using hidden word game? 2) how is the students’ vocabulary achievement after they were taught by using hidden word game? 3) is there any significant effect of the use of hidden word game on the students’ vocabulary achievement? The purposes of the study were: 1) to know the students vocabulary achievement before they were taught by using hidden word game. 2) to know the students vocabulary achievement after they were taught by using hidden word game. 3) to know whether hidden word games gave significant influence(s) toward the student’s achievement in vocabulary ability or not. The research method used was experimental method and quantitative approach. Methodology of the research, pre-experimental research with pre-test and post test design. The researcher took two classes as sample of this research; there were E-class and F-class. Data collecting methods used in this research were interview and test. Result shows that a) the students’ vocabulary achievement before using Hidden Word Game is lower. The evidence is pre test and post test average were 27,88 (pre test) and 34,5 (post test), b) the students mastery on vocabulary by using Hidden Word Game it is shown the students’ score is high. This evidence is pre test and post test average were 29,75 (pre test) and 89,13 (post test), c) there was significant effect of thee using Hidden Word Game on the students vocabulary . Based on the statistical test result by using t-test shows t-table = 1,99 and t-test = 9,95. it means that the using Hidden Word Game there is significant effect in the vocabulary between thought by using hidden word game and those thought without using hidden word game