This chapter try to answer the following question “Do online games affect player’s vocabulary learning skills? What types of vocabulary could be in online games? And What do the players think about their improvement of vocabulary via online games? In order to answer these questions, the researchers conduct the material; vocabulary tests together with the survey questionnaire online vocabulary games could help them with their vocabulary learning. The purpose of this chapter is to describe, (1) Subjects, (2) research procedures, (3) research instruments, (4) collection and analysis of data.