Final answer:
The Agile SDLC model is most suitable for an early access game due to its adaptability and iterative approach, allowing frequent reassessment and addition of features based on user feedback. The DevOps model is also a strong choice, emphasizing continuous delivery and collaboration.
Step-by-step explanation:
The best SDLC model for an early access game that promises a set roadmap of more features and systems to be added later would be the Agile SDLC model. Agile thrives on adaptability to change and customer feedback, which is essential for an early access game that is expected to evolve over time. In Agile, development is carried out in iterations, each delivering a usable increment of the product. This allows the development team to frequently reassess the direction of a project and make adjustments as new features are requested or priorities change.
Another approach tailored for continuous delivery and deployment, which suits an early access game, is the DevOps model. DevOps emphasizes collaboration between software developers and other IT professionals while automating the delivery process and infrastructure changes. It aims to establish a culture and environment where building, testing, and releasing software can happen rapidly, frequently, and more reliably. This model scales well with the nature of ongoing development and community feedback inherent to early access games.