Educational computer games continue to overwhelm educators with design and development complexities, time, and cost and underwhelm learners regarding immersive, intuitive, and enjoyable game play. No complete model or comprehensive guideline for content development or game design exists for educators and game designers to follow in the creation of educational games that adapt to learners in real-time. This research developed and validated the ALGAE (Adaptive Learning GAme dEsign) model, a comprehensive adaptive learning model based on game design theories and practices, instructional strategies, and adaptive models. This dissertation extends previous research in game design, instructional strategies, and adaptive learning, combining these three components into a single complex model. The results of this study include the validation and applicability of the ALGAE model, benefits and challenges of using the model, and insights regarding the focused and unfocused implementation approaches. The study also reveals the cross-industry applicability of the model to include government agencies, military units, game industry, and academia.