Here you can see a high-level design process you can apply for any product.
The design process splits into two phases "Discovery" and "Design".
There are many methodologies for user research and tools for design and validation. The combination of those depends on the nature and complexity of the product. Each game and feature should be approached individually.
What if you have UX Designers or Researcher in your team or even an entire UX Team? Congratulations! You have a great chance to develop a unique, innovative and high-quality product and be sure it applies to the target audience and market.
UX Team will help you with:
There are a lot of Design Deliverables, not all of them required for every project. Trust your UX designer to define the best methodologist and deliverables for your product. It is important to remember deliverables have to be delivered in a particular order, you can see in the picture below.
The iterative design process is equally essential for both new and live games.
It makes the development journey shorter and smoother. It helps keep the team's focus on the product and entire experience rather than on individual deliverables.
From the Interaction Design Foundation
New game's production highly interactive process. It requires a small, highly skilled team.
Each pillar on the flowchart below has several sub pillars with specific design deliverables.
Live game's pipeline looks a bit more waterfowlish and simple, but sometimes it is much more complex due to many features that could be developed in parallel and have dependencies on each other.