Teens need social and emotional skills to thrive, but most SEL offerings for teens lack impact. We present a case study of a field-tested method for engaging teens in SEL and social justice using game design as experiential learning. Game Design Studio, co-created with teens, invites them to choose topics they want to explore and design for the changes they want to make in the world. Analog and digital gameplay and design become vehicles for reflection, self-expression, and change.