The iDREAMS project aims to reinvent Computer Science education in K-12 schools, by using game design and computational science for motivating and educating students through an approach we call Scalable Game Design, starting at the middle school level. In this paper we discuss the use of Computational Thinking Patterns as the basis for our Scalable Game Design curriculum and professional development and present results from measuring student learning outcomes using our unique Computational Thinking Pattern Analysis. (Contains 7 figures and 2 footnotes.)