The Scalable Game Design Summer Institute is a program that brings technology and content (STEM, Language Arts) teachers from middle, high schools, and upper elementary classrooms together to learn how to use game design for computer science education and how to teach computational/critical thinking and problem solving literacy. Teachers, called Institute Scholars, receive training at 3 levels: Beginner, Intermediate, and Advanced. Thanks to research funding from the National Science Foundation and Google CS4HS, the 2015 Summer Institute professional development training is available FREE to Scholars teaching in USA schools and accepted to the Institute (includes daily workshops, lunch/snacks, software, evening program, but does NOT include travel, lodging, or dinner). All Scholars also participate in research data collection and receive a stipend for their contribution. Beginner level Scholars master 2D game design and how to teach the curriculum in classrooms and receive an introduction to STEM applications. For more information, please visit http://sgd.cs.colorado.edu/wiki/Summer_Institute_2015.