Extensive modding for experimental game research

This chapter covers the topic of extensive modding in the area of experimental game research. In simplified terms, modding a computer game means changing specific aspects of how the game looks and feels to the user. This also includes applying minor changes to the game, such as changing the appearance of just a few objects, which does not require a high degree of expertise. Solely relying on making minor changes, however, severely limits the type of research questions that can be addressed. Therefore, we advocate extensive modding, which refers to modifications of a large extent that allow researchers to examine almost any research question imaginable. Extensive modifications may range from major content extensions or replacements, like new tasks or quests, game environments, characters or game mechanics, to total conversions, like changing the game scenario or theme, or the game genre. To apply these changes, researchers have to know which modding tools are available for a given game and how to use them properly. Advanced modifications, such as changing the behaviour of the game world and its inhabitants or even the fundamental mechanics of the game, often require deep knowledge of the game, game design, the modding community and--depending on the game--a certain level of programming skills.