What design pattern would be appropriate for creating a globally accessible instance of a manager in Unity?

The Singleton design pattern is particularly suitable for creating a globally accessible instance of a manager in Unity due to its structure, which restricts a class to a single instance while providing a global point of access to that instance.

In game development, it is often necessary to have a single authority for managing game states, input systems, or other shared resources, which can be achieved through a Singleton. When implemented correctly, the Singleton pattern ensures that only one instance of the manager exists throughout the lifecycle of the application, simplifying access to this instance from various components of the game. This helps in maintaining consistency and managing shared states without the need for making multiple instances and dealing with data synchronization issues.

The pattern is typically implemented using a static property to control the instance creation while checking if the instance already exists. If not, it creates one, thus preventing multiple instances from being created.

This approach is very common in games, especially for manager classes such as AudioManager, GameManager, or InputManager, where continuous access to the same instance is required for various aspects of gameplay or functionality.