Video game design starts with an idea, often a variation or modification on an existing concept. The game idea will fall within one or several genres and designers will often experiment with mixing genres. The game designer usually produces an initial game proposal document containing the concept, gameplay, feature list, setting and story, target audience, requirements and schedule, staff and budget estimates.
Multiple design decisions are made during the course of a game's development; it is the responsibility of the designer to decide which elements should be implemented. For example, consistency with the game's vision, budget or hardware limitations. Design changes will have a significant impact on required resources.
The designer may use scripting languages to implement and preview design ideas without necessarily modifying the game's codebase. A game designer often plays video games and demos to follow the markets' development.
Over time, it has become common for a game designer's name to misleadingly be given an undue amount of association to the game, neglecting the rest of the development team. This is in stark contrast to the industries' origins, when creators were often given little to no recognition. Coincidentally, this lack of credit lead Warren Robinett to create the first Easter egg in a video game.
Funding, traditionally provided by game publishers, who may have specific expectations from a game, must be taken into account, as most video games are market-driven—developed to sell for profit. However, if financial issues do not influence designer's decisions, the game can become design- or designer-driven; but few games are designed this way, with it becoming more common among indie game developers, alongside alternative sources of funding, like Early Access or Crowdfunding. Alternatively, a game may be technology-driven, such as Quake (1996), to show off a particular hardware achievement or to market the game engine. Finally, a game may be art-driven, such as Myst (1993) and Journey (2012), mainly to show off impressive visuals designed by artists.
In Rules of Play (2004), Katie Salen and Eric Zimmermann write:
A game designer is a particular kind of designer, much like a graphic designer, industrial designer or architect. A game designer is not necessarily a programmer, visual designer or project manager, although sometimes he or she can also play these roles in the creation of a game. A game designer might work alone or as part of a larger team. A game designer might create card games, social games, video games or any other kind of game. The focus of a game designer is designing game play, conceiving and designing rules and structures that result in an experience for players.