What is user interface design in games?
What is a game user interface? A video game user interface is a system of visual components that allows players to interact with the game story (narrative) and break into the game space (the fourth wall). There are four classes of UI in video games: Non-diegetic, Diegetic, Meta, and Spatial.
Why is UI important in games?
A user interface in games' purpose is to allow a user to carry out a task within a game world either through direct input or through an action on a Heads Up Display (HUD). The user interface is the section of a program that allows for human-computer interactions (HCI).