Meningkatkan Penguasaan Kosakata Murid dengan Menggunakan Puzzle Game di Kelas B pada TK Al – Ghifari Pekanbaru.

English vocabulary learning in kindergarten needs to be improved continuously. This research was carried out to improve the pupils‟ vocabulary mastery at grade B of Al – Ghifari Kindergarten Pekanbaru. The purposes of this research were focused to find out whether puzzle game can improve the pupils‟ vocabulary mastery and to explain the factors that can influence the changes of their vocabulary mastery during the use of puzzle game. This research was carried out in the design of classroom action research, which was a cyclical process that involved planning, action, observation, and reflection-, for two cycles. Twenty pupils (12 male and 8 female) in grade B of this school were participated in the research. In every cycle, a collaborator helped the researcher to collect two types of data, namely qualitative and quantitative data. The qualitative data were collected by using observation sheets for the researcher and the students. Besides, field notes were also used to collect the qualitative data that out of the observation sheets. Then, the quantitative data were collected by administering vocabulary mastery test to the pupils at the end of a cycle. After carrying out this classroom action research for two cycles, the findings show that all indicators of the pupils‟ vocabulary mastery were improved positively. Their ability in understanding the meaning of the learned words during the use of puzzle game improves from cycle 1 to cycle 2. Also, the pupils‟ ability to say a number of learned words appropriately (form) is improved from cycle 1 to cycle 2. Moreover, the factors influencing the changes of the pupils‟ vocabulary mastery using puzzle games are revealed. They are the use of colorful pictures in the puzzle, the use of challenging puzzles, and providing the pupils with opportunities for practicing both words‟ meaning and pronunciation during the activities of using puzzle games