AgentSheets is an early incarnation of the now popular objects-first philosophy (Barnes & Kölling, 2006). In the spirit of scalability, the visual programming language featured in AgentSheets is highly accessible to students without any programming background. It lets novices create simple games such as Frogger in a few hours, yet it is powerful enough to let more experienced programmers create sophisticated games such as Sims-like games using AI techniques (Repenning, 2006a, 2006b) and scientific simulations. AgentSheets also supports the transition to traditional programming by letting students render their visual programs directly into traditional programs. This versatility is essential for Scalable Game Design.