Learning history is vital for students' intellectual, spiritual, emotional, and physical development. Students perceive history subject as difficult and boring because they must memorize facts and understand those facts, concepts, time, and historical events. Interactive multimedia can increase students' enthusiasm and make the teaching and learning process more interesting to make the history "alive." Game-based learning uses game elements and principles to effectively deliver teaching and learning process in the classrooms. "Yamashita's Treasure: A Quest to Find the Treasure" is a game-based instructional material designed for grade 7 students of the Philippine K-12 curriculum that aims to teach significant lessons and events occurred in the Philippines over the last century. In this paper, we present findings from an assessment of an instructional material in teaching Philippine history. A System Usability Scale (SUS) was used to test the system's usability which generated a positive score. Respondents were highly satisfied with the game's usability scoring 87.5 on the SUS. Future work includes developing a programmed system, conducting quasi-experimental research design, and consultations with the experts for further enhancement.