<![CDATA[Understanding concepts is the foundation of learning mathematics. However, in reality, many students still struggle to understand mathematical concepts, including material on function transformation. Practicing structured questions and applying game-based learning models is one way to overcome these challenges. Apart from that, incorporating contextual learning with elements of local culture is important to integrate into learning activities so that students feel connected and happy while learning. This research employs the research & development method using the ADDIE (analyze, design, develop, implement, evaluate) development model. The model aims to describe the process of developing BLIFOSI (Blitar Function Transformation) media, specifically an educational board game based on the Blitar City Map, to facilitate understanding of function transformation materials. This research involved 35 students from Class XI at SMAN 2 Blitar. The validation results of media and material experts show that BLIFOSI is valid and suitable for application in learning activities. In addition, students' responses in the positive response questionnaire show that BLIFOSI is practical to use. Meanwhile, the test results showed that 94.28% of students obtained a score ≥ KKTP. These results demonstrate that BLIFOSI can support students' conceptual understanding of functional transformation material. Keywords: BLIFOSI, Concept Understanding, Function Transformation]]>
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