From the Super Mario Wiki, the Mario encyclopedia

As an encyclopedia, the Super Mario Wiki does not censor its content. This means you may end up reading content about a point in a game you have yet to reach, secrets you have yet to find, content you disagree with, etc. in an effort to cover everything as accurately as possible. You can also read more about censorship in the last point of MarioWiki:Courtesy.

However, there are times where game content gets revealed sooner than it should be, usually through broken street dates or datamines, instead of being officially shown off or in endorsed publications. In the case of leaks, so long as the information is credible (as in, the information is plainly verifiable and accessible to anyone, such as a video or a screenshot, but not something that is easily edited like a text document), we will not censor that content either. We will cover it as we would any other piece of information. If you do not want to see information for a game, you should avoid any relevant articles or sections.