NIM:3213063024 Suciati, Alipi, The Effectiveness of Using Hidden Word Game to Improve Vocabulary Mastery of the Seventh Grade Students of SMPN I Munjungan, Thesis, English Program, STAIN Tulungagung. Advisor: Arina Shofiya M.Pd, 2010. Key words: Hidden Word Game, Vocabulary Mastery, The Seventh Grade Students English is an important to study, because it is an internatioanal language. T…