Game mechanics are among the hardest parts of a game to design because they are difficult to visualize and inconvenient to simulate quickly. In this lecture, Ernest Adams and Joris Dormans introduce a new visual framework and tool called Machinations that allows designers with no programming experience to diagram mechanics in a tool like Visio and simulate them in real time. In addition the session will present a library of design patterns that participants can use. Machinations is available free; this is not a product demo.