Mathematics plays a crucial role in modern society, especially in science, technology, and engineering. However, typical school math often fails to spark students' interest as it lacks connections to real-world problems and engaging activities. At ARENA STEM, we aim to make math learning fun and relevant by linking mathematical concepts to real-life challenges in STEM fields. Our course consists of four sessions: the first introduces the course and involves fun math games, the second focuses on project-based learning, where students design their own math projects. In the third session, students tackle advanced math problems from competitions like Kangaroo or MOEMS. The final session involves project presentations and feedback. Ultimately, we strive to nurture curiosity and show students how math can be both useful and enjoyable.