The scarcity of engaging science learning media in primary schools often leads to low student enthusiasm and difficulties in grasping abstract concepts, making cooperative game-based media development an urgent instructional necessity. This study aimed to develop and determine the feasibility of Smart UNO Sains (SUS) integrated with the Teams Games Tournament (TGT) cooperative learning model for changes in the states of matter topic in fourth-grade elementary school. This study employed the Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The study was conducted during the second semester of the 2025/2026 academic year at SD Negeri 019 Sungai Kunjang, Samarinda, involving 3 media experts, 3 subject matter experts, 2 fourth-grade teachers, and fourth-grade students (10 students for small-scale and 29 students for large-scale trials). Data were gathered via observations, interviews, and questionnaires, then analyzed using qualitative and quantitative descriptive techniques. The results indicated that Smart UNO Sains achieved an average material validity of 87.90% (very valid) and media validity of 87.25% (very valid). The practicality evaluation yielded 85.00% from teacher responses (very practical), 84.84% from the small-scale trial (very practical), and 92.24% from the large-scale trial (very practical). Thus, the TGT-based Smart UNO Sains is proven highly feasible and practical for primary science learning. ABSTRAK Keterbatasan variasi media pembelajaran sains di sekolah dasar memicu rendahnya antusiasme dan pemahaman siswa pada materi abstrak, sehingga inovasi media berbasis permainan kooperatif sangat mendesak untuk dikembangkan. Penelitian ini bertujuan untuk mengembangkan dan menguji kelayakan media Smart UNO Sains (SUS) berbasis model kooperatif tipe Teams Games Tournament (TGT) pada materi perubahan wujud zat kelas IV sekolah dasar. Penelitian ini menggunakan metode Research and Development (R&D) dengan model ADDIE (Analysis, Design, Development, Implementation, Evaluation). Penelitian dilaksanakan pada semester genap Tahun Ajaran 2025/2026 di SD Negeri 019 Sungai Kunjang, Samarinda, yang melibatkan 3 ahli media, 3 ahli materi, 2 guru kelas IV, serta siswa kelas IV (10 siswa uji coba skala kecil dan 29 siswa uji coba skala besar). Data dikumpulkan melalui observasi, wawancara, dan angket, kemudian dianalisis secara deskriptif kualitatif dan kuantitatif. Hasil penelitian menunjukkan bahwa media Smart UNO Sains memperoleh rata-rata skor validitas materi sebesar 87,90% (sangat valid) dan validitas media sebesar 87,25% (sangat valid). Uji kepraktisan memperoleh respons guru sebesar 85,00% (sangat praktis), uji coba skala kecil sebesar 84,84% (sangat praktis), dan uji coba skala besar mencapai 92,24% (sangat praktis). Dengan demikian, media Smart UNO Sains berbasis TGT dinyatakan sangat layak dan praktis digunakan sebagai media pembelajaran IPA di sekolah dasar.
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