GAS 2013 explores issues that crosscut the software engineering and the game engineering communities. Advances in game engineering techniques can be adopted by the software engineering community to develop more engaging applications across diverse domains: education; healthcare; fitness; sustainable activities (e.g., recycling awareness); and so on. Successful computer games feature a property that is not always found in traditional software: they are fun and engaging. Engaging games enthrall players and result in users willing to spend increasing amounts of time and money playing them. In addition, GAS 2013 provides a forum for advances in software engineering for developing games that enable progressive societal change through fun, playful game software. Software engineering techniques spanning patterns, middleware, testing techniques, development environments, and processes are of great interest. Last year’s GAS 2012 workshop brought together people from various fields and investigated the possibilities of this exciting research area - we aim to continue building these relationships and advancing the state of the art.