Let's design a geographically partitioned multi-player card game. Imagine a system where players from different regions can join and play card games together. The core challenge lies in efficiently managing game sessions across geographical locations, ensuring low latency for players within the same region, and providing a seamless experience regardless of the distance between players. Think of it as a global card table where people from different continents can virtually sit together and enjoy a game. The game logic itself isn't the focus here; it's more about the infrastructure that supports these distributed games.

We need to consider aspects like:

• Region Management: How do we define and manage geographical regions?
• Game Session Allocation: How do we ensure players are matched with games in their region or a suitable cross-region?
• Scalability: How does the system handle a large number of concurrent games and players?
• Fault Tolerance: What happens if a region goes offline?
• Latency: How do we minimize latency, especially for players in the same geographical region?
• Concurrency: How do we deal with multiple operations occurring simultaneously on shared game state?

Requirements