Educational games (EG) as learning software have become more dominant in the educational industry and have gained immense popularity. However, a constant battle between designing an EG that combines fun and educational content in delivering learning objective is a prominent challenge through the designing phase for various stakeholders involved, especially game designers. This chapter discusses three major contributions to game design fundamentals and principles and unpacks their concepts on designing EG. Moreover, an in-depth discussion of game design models/frameworks is understood. This analysis highlights issues and problems raised through the gaps existing between models/frameworks against them. This chapter proposes a combined prototyping process adopted from the discussion and emphasizes aspects required in documenting game design. With the process documented and aligned, game designers will be able to reflect a better understanding of a game design process in the industry.