Currently, over 30 million adults in the United States alone are unable to read. Learning Games Studios, spun out of a research network led by MIT's Education Arcade and University of Wisconsin's Games+Learning+Society Center, offers evidence-based mobile games that deliver measurable learning outcomes, leading to opportunities for advanced education and employment for adult learners. Their award-winning first product, Xenos Isle, combines a social virtual world with single and multiplayer games to engage users, support persistence and problem-solving, and evoke a positive emotional response while building motivation to master challenging foundational and soft skills. With over 250 hours of instructional content, Xenos' educational games are not drills or quizzes, but rather engaging experiences that require the effective use of language and literacy skills for successful game play. Strong game design and mechanics keep learners engaged, pulling them through the curriculum and creating high time on task. Unlike place-based programs, mobile access makes it convenient for learners to use while in class, while commuting, or from home. Because Xenos is both device and operating system agnostic, it can be used on phones, tablets, and computers, as well as across these platforms when players are on different devices -- translating to a scalable and cost-effective implementation model.