The researcher in this study did an observation at SMA BOPRKI 2 Yogyakarta during the PLP-PP. Mostly, the students were not provided with enough reading materials. Therefore, the researcher of this study was interested to design interesting supplementary reading materials for senior high school students. This study was formulated into two research questions: (1) How is a set of supplementary reading materials using the gamification method suitable for senior high school students designed? (2) What does a set of supplementary reading materials using the gamification method design for senior high school students look like? This study used Design and Development Research Method Level 1 proposed by Richey and Klein (2009). There were five steps used in this study, namely, potentials and problems, literature study and information collecting, designing product, design validation, and validated design. The researcher in this study collaborated with three experts to validate the product of this study. The experts consisted of a lecturer from the English Language Education Study Program (ELESP) at Sanata Dharma University and two English teachers from the SMA BOPKRI 2 Yogyakarta.

Keywords: reading skill, gamification method, supplementary materials