Games are an effective and cost-saving method in education and training. Although much is known about games and learning in general, little is known about what components of these games (i.e., game attributes) influence learning outcomes. The purpose of this article is threefold. First, we review the literature to understand the “state of play” in the literature in regards to learning outcomes and game attributes—what is being studied. Second, we seek out what specific game attributes have an impact on learning outcomes. Finally, where gaps in the research exist, we develop a number of theoretically based proposals to guide further research in this area.