<![CDATA[Limitations in students' critical thinking skills make it difficult to understand abstract concepts in the chemistry topic of reaction rates, even though critical thinking skills are essential in the twenty-first century. This study aims to develop an Augmented Reality (AR)-based Multimedia that is feasible to use to enhance students' critical thinking skills in the context of the reaction rate topic. Employing a Research & Development (R&D) approach based on the 4D model, the study involved 34 purposively selected twelfth-grade students from State Senior High School 1 Driyorejo. This study used questionnaires, observations, and tests, including validation sheets, student response questionnaires, pre-tests and post-tests, and observation sheets. AR multimedia obtained a mode of 5 in content validity, and construct validity is considered valid. Practicality was confirmed through a student response questionnaire, which scored 91.4%, categorised as practical, and supported by a 99.4% observation score of student activities. Effectiveness was demonstrated by a significant improvement in critical thinking skills, with an overall N-gain score of 0.73 (in the high category) and a Paired Sample T-test p-value of 0.001. Consequently, the developed AR-based multimedia is considered feasible, and teachers are recommended to use it, as it is practical and effective for improving students' critical thinking skills.]]>
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