Currently, there is a lack of systems development methodologies (SDMs) suitable for the development of location-based games. This research introduced a newly developed SDM to aid in the development process of location-based games, called the developmental methodology for location-based games (DMLBG). The DMLBG was based on SDMs most often used for developing mobile applications, as well as mobile and traditional games. Four case studies were used to test the DMLBG. During the case studies, independent games development teams used the DMLBG extensively to test the feasibility of the SDM. The results showed that the SDM did aid all four of the teams to successfully develop a location-based game. The teams documented the development process and gave critical feedback on their experiences. This feedback was used to revise and improve the SDM. The DMLBG addressed the lack of an SDM that is suitable for the development of location-based games.