<![CDATA[This research is motivated by the low conceptual understanding and critical thinking skills of third-grade elementary school students in Science and Social Studies (IPAS), specifically on the ecosystem material. This study aims to examine the effect of applying the Team Games Tournament (TGT) cooperative learning model assisted by Baamboozle media on these two skills. The research method used is Mixed Methods with an Explanatory Sequential design. The sample consisted of 60 students divided into an experimental class (30 students) and a control class (30 students). Data collection used written test instruments, observations, and interviews. The results of the quantitative analysis using the Mann-Whitney test showed a significant increase in the experimental class compared to the control class. The average N-Gain for conceptual understanding in the experimental class was 0.71 (high category), and the N-Gain for critical thinking was 0.62 (medium category). Regression tests proved a positive correlation, where critical thinking skills contributed a 39.1% influence on students' conceptual understanding. Qualitative data supported these findings, showing that the integration of gamification and group competition successfully created an effective peer tutoring ecosystem, reduced boredom, and stimulated students to discuss and argue logically. In conclusion, the Baamboozle-assisted TGT model is proven effective in comprehensively improving students' conceptual understanding and critical thinking. Keywords: Team Games Tournament, Baamboozle, Conceptual Understanding, Critical Thinking, Science and Social Studies]]>
