<![CDATA[Abstract: This study aimed to develop an educational board game based on Problem-Based Learning (PBL) integrated with a Mindful Learning approach to improve students' critical thinking skills on the topic of Archaebacteria and Eubacteria. This study employed a Research and Development (R&D) method using the 4D development model (Define, Design, Develop, and Disseminate). The research subjects consisted of one material expert, one media expert, one biology teacher, and 29 tenth-grade students of SMA Negeri 16 Surabaya. Data were collected through validation sheets, response questionnaires, observation sheets, and critical thinking tests, and were analyzed using descriptive quantitative techniques. The results showed that the developed learning media achieved a validity score of 100% from the media expert and 95% from the material expert, indicating that the product was highly valid. Students' responses were categorized as good, indicating that the board game was practical and easy to use in classroom learning. The implementation results also indicated an improvement in students' critical thinking skills based on the pretest and posttest results (insert the N-Gain score or statistical test results if available). Therefore, the educational board game based on PBL integrated with a Mindful Learning approach met the criteria of being valid, practical, and effective, making it suitable as an alternative learning media for teaching Archaebacteria and Eubacteria.Abstrak: Penelitian ini bertujuan mengembangkan media pembelajaran berupa board game edukatif berbasis Problem Based Learning (PBL) dengan pendekatan Mindful Learning untuk meningkatkan kemampuan berpikir kritis peserta didik pada materi Archaebacteria dan Eubacteria. Penelitian ini menggunakan metode Research and Development (R&D) dengan model pengembangan 4D (Define, Design, Develop, dan Disseminate). Subjek penelitian terdiri atas satu ahli materi, satu ahli media, satu guru biologi, dan 29 peserta didik kelas X. Data dikumpulkan melalui lembar validasi, angket respons, lembar observasi, serta tes kemampuan berpikir kritis dan dianalisis secara deskriptif kuantitatif. Hasil penelitian menunjukkan bahwa media yang dikembangkan memperoleh tingkat validitas 100% dari ahli media dan 95% dari ahli materi dengan kategori sangat valid. Respon peserta didik terhadap media berada pada kategori baik, yang menunjukkan bahwa media praktis digunakan dalam pembelajaran. Hasil implementasi juga menunjukkan adanya peningkatan kemampuan berpikir kritis peserta didik berdasarkan hasil pretest dan posttest setelah menggunakan board game edukatif berbasis PBL dengan pendekatan Mindful Learning. Dengan demikian, media yang dikembangkan memenuhi kriteria valid, praktis, dan efektif sehingga layak digunakan sebagai alternatif media pembelajaran pada materi Archaebacteria dan Eubacteria.]]>
