This study aims to analyze the application of the Game-Based Learning (GBL) method assisted by Baamboozle on the reduction of mathematical anxiety and the improvement of students' mathematical concept understanding. This study uses a qualitative approach with a case study method on three high school students in Cirebon City. The instruments used included a mathematical anxiety questionnaire, pretest and posttest questions, and interviews. The research results show that the application of the GBL method assisted by Baamboozle successfully reduced students' mathematical anxiety levels, with the proportion of students in the high-anxiety category decreasing from 12.5% to 3.1%, and those in the low-anxiety category increasing from 3.1% to 15.6%. Students' mathematical conceptual understanding also improved significantly, with the percentage of students in the high category rising from 15.6% to 62.5%, while no students remained in the low category. These findings indicate that the GBL method is effective in enhancing students' mathematical concept comprehension by creating a more enjoyable and interactive learning atmosphere. This research is expected to contribute to the development of more innovative and effective teaching methods in mathematics education and serve as a reference for educators in creating a supportive learning environment.