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Creative Problem Solving (CPS) is a must-have skill that should be built and developed by the students to be able to compete in the 21st century. CPS is a process to solve a problem faced imaginatively and resulted an effective action. There are 4 aspects that is assessed in CPS which are fact finding, problem finding, idea finding, and solution finding. With an assumption that CPS could be trained and improved, this research aim is to investigate the enhancement of senior high school student-s CPS skill after practicing a STEM based learning. The topic in this research is the concept of momentum and impuls using LEGO® Mindstorm EV3 as the media. This study use a pre-experimental method with one group pretest-posttest design. The sample of this research is 25 senior high school students in Bandung that are determined with cluster random sampling technique. By analyzing the N-Gain, result shows that the enhancement of CPS skill is on the middle category with between 0.31 – 0.63