This chapter presents the game K-Hunters, a serious game with the purposes of decreasing the isolation time and helping the learning process of children with autistic spectrum disorder (ASD). The game uses geolocation, virtual reality, and augmented reality techniques to provide an environment to hunt and capture virtual monsters, holders of knowledge. These monsters are geographically spread throughout the real world and can be associated to learning objects. Through mobile devices, the users can go out hunting the monsters, capture them, and view their learning object-related content. Thus, the users are encouraged to get out of their isolation, to search for the virtual monsters, to obtain knowledge, as well as being inserted in scenarios favorable to interpersonal interaction.