This study aimed to develop a Snake and Ladder learning media on vertebrate and invertebrate animal classification to improve the critical thinking skills of third-grade elementary school students. The research employed a Research and Development (R&D) method using the 4D model, consisting of Define, Design, Develop, and Disseminate stages. Data were collected through observations, interviews, questionnaires, and tests. The results showed that the developed media achieved a validity score of 95% from material experts, 95% from media experts, and a feasibility score of 98% based on teacher responses. Furthermore, students' average scores increased from 76.05 to 86.58 after the implementation of the media. Therefore, the Snake and Ladder learning media can be used as an innovative learning resource to enhance students' critical thinking skills.
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