Game design is the process of designing the content and rules of a game. The term is also used to describe both the game design embodied in an actual game as well as documentation that describes such a design..

Iterative design tends to be more suitable for core game mechanics (or gameplay) where the emergent properties of the design can be very hard to predict. On the other hand, game elements such as story, setting, logical flow and level designs often lend themselves to being designed on paper, although almost invariably some unforeseen issues will arise that will need to be dealt with through a modification of the paper design. Thus, even a design document can and usually does undergo some kind of iterative process during the development of a game, either formally or informally.

Numerous games have narrative elements which give a context to an event in a game, make the activity of playing it less abstract and enhance its entertainment value, although narrative elements are not always clearly present or present at all. Tetris is an example of a game apparently without narrative. It should be noted that some narratologists claim that all games have a narrative element. Some go further and claim that games are essentially a form of narrative. Narrative in practice can be the starting point for the development of a game, or alternatively can be added to a design that started as a set of game mechanics.