Wikipedia:WikiProject Video games/Navboxes
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In the past, computer and video games had a motley assortment of navigation templates (typically called "navboxes") scattered at the bottom of many different pages. Such templates are often useful for linking series of articles, such as a series of games, but they can easily become too large, garish, or even malfunction, impairing usability. This guideline discourages many of the excesses, while suggesting how to make useful navigation templates that guide users within an article series.
What to avoid
Many older templates used "hide/show" functions, to compensate for excessive size. Such functions often had problems in certain browsers and could easily cause display glitches if improperly implemented. These guidelines should resolve the issues of overlarge templates that led to the popularity of such functions, so hide/show functions are no longer needed (and are indeed explicitly discouraged because of the glitches).
Try not to link overspecific articles, particularly in the case of spinoff games or articles about fictional characters, places, objects, or concepts. Instead, link umbrella articles, so that readers can have a larger context in which to place such articles. {{tl|Metal Gear series}}, a template for the long-running Metal Gear video game series, links only a comprehensive list of characters, rather than cramming all of the main characters into the template. This helps discourage disputes about which ancillary articles are or are not important enough to go into the template as well as template bloat; if there is any doubt, they probably should be excluded.
Don't link to articles that don't exist yet or to article sections. While red links encourage people to write articles, navboxes are primarily for navigation, and if we don't have an article for Kwazy Quux Gaiden: Densetsu no Quux yet, it doesn't aid navigation to link an article that doesn't exist.
Avoid linking to articles for unreleased games, unless they are particularly noteworthy despite the fact that they were or are unreleased. Articles for upcoming games are often of low quality and subject to sudden change; such games are often cancelled, renamed, or turn out to be hoaxes or misunderstandings, and this is assuming they don't flop or otherwise turn out to be not terribly noteworthy after their release. As a rule of thumb, an unreleased game that does not have a definite release date should usually be excluded, and a game that has never been shown in playable form or does not have a definite release title should never be included.
Cancelled games (or games that saw only limited, regional release) almost never merit inclusion; their articles tend to be of extremely limited interest, limited only to readers already intimately familiar with the series as a whole and its history. There are exceptions to these rules, particularly in the case of otherwise small templates or extremely notable unreleased games (e.g. Duke Nukem Forever), but in general it is best to err on the side of exclusion.
Bloated templates
If you feel a navbox contains too many links use {{CVGnavbox-bloated}} (as stated on it's page) and start a discussion on what can be removed from the navbox. Tagged templates will be placed into :Category:CVG navbox cleanup.