The computer game has evolved in recent years into a medium that exemplifies the use of digital technologies and the establishment of new media trends. The young discipline of Game Studies seeks to understand the peculiarities of this constantly renewing medium and develops as dynamically as its subject of research. This introduction presents key areas of computer games and game theory: the volume discusses the specific genre conventions of computer games, the status of images and interfaces, the experiences and involvement of players, as well as special effects of disruption. With a set of analytical perspectives and methods closely related to the material, this introduction provides a comprehensive picture of the medium and its science.