When making level and world pages, remember to include both the level directory (i.e.
Template:NSMB2 Levels) and the overall navigation template for the game (i.e.
Template:NSMB2). The directory goes above the general nav template. (All this is in accordance with the Nav Template Policy (
MarioWiki:Navigation Templates) - in particular, the fourth paragraph of this section (
MarioWiki:Navigation_Templates#Game-Specific_Templates).) Also, while nav templates are usually "expandable" (i.e. collapsed by default), I think making the level directories "collapsible" like "NSMB2 Levels" is better, since it makes navigating the levels and worlds a bit faster, and with only two templates per page, it's not like we need to save space.
In addition, most level pages should only have one category - the game-specific level category (i.e.
Category:New Super Mario Bros. 2 Levels). The world pages get game-specific world categories (i.e.
Category:New Super Mario Bros. 2 Worlds). Both these categories are themselves part of the overall game category, which, therefore, doesn't need to go on the articles directly; the pages also shouldn't get the overall
Category:Levels or
Category:Worlds categories (again, the game-specific categories are the ones that re put into these categories, rather than the articles themselves). This avoids cluttering up the generalized categories, making them easier to use; it's also in accordance with the Categorization Policy (
MarioWiki:Categories).
The world articles also get categories about their environment, if applicable (i.e.
World 1 (New Super Mario Bros. 2) is in
Category:Grasslands), but for the most part, I've found that the specific level articles
aren't given these categories. This makes sense since the worlds are essentially speaking for their levels in these situations, so not categorizing the levels avoids redundancy and cuts down on clutter. I suppose the exception to this would be when you have levels that are different from the overall world (for example,
NSMB2's
World Star levels could all get environmental categories since they're all unique; the original
SMB's 1-2 would be a "Subterranean Area (
Category:Subterranean Areas)" while the rest of the world wouldn't get any category, since it's just a generic setting; and
SMW would have lots of its levels being specifically categorized).
In summary (using NSMB2 as an example), world articles get this:
{{BoxTop}}
{{NSMB2 Levels}}
{{NSMB2}}
[[Category:<environment>]] (if applicable)
[[Category:New Super Mario Bros. 2 Worlds]]
And level articles get this:
{{BoxTop}}
{{NSMB2 Levels}}
{{NSMB2}}
[[Category:<unique environment>]] (if applicable)
[[Category:New Super Mario Bros. 2 Levels]]
