Abstract History learning in Indonesian senior high schools continues to rely on lecture-based instruction and static textbooks, resulting in low student motivation particularly among Generation Z learners who are accustomed to visual and interactive content. This development research aimed to produce an interactive story mapping learning medium titled "Jejak Cahaya di Nusantara" for Grade X students on the topic of the entry of Islam into the Nusantara. The medium was developed using the ADDIE model, limited to formative evaluation, with the theoretical framework of Game-Based Learning (GBL) and the MUSIC Model of Motivation. Needs analysis was conducted through a literature-based desk study due to field access limitations. The final product is a web-based application consisting of four explorable routes (Gujarat, Persia, Makkah, and China), four playable characters, a badge system, and twelve quizzes aligned with MUSIC principles. Media expert validation yielded an average score of 4.58 out of 5 (89%), categorised as "Very Feasible." Feasibility testing produced an average score of 4.76 out of 5 (95%), also categorised as "Very Feasible." Qualitative feedback indicated that the gamification system effectively increased learning engagement, though item discrimination in quiz questions requires improvement. This study recommends full-scale implementation in classroom settings and further experimental research to measure the medium's effect on learning outcomes. Keywords: story mapping; game-based learning; MUSIC model; history of Islam in Nusantara; Educational Media Development