List of unreleased media

Due to various reasons (ranging from being of poor quality, being produced for a failed or soon-to-be-discontinued system or having its developer facing financial or legal woes), a game can end up being cancelled and cease production. Despite their status, concepts present in cancelled games can end up being reused in commercial releases and some cancelled games can end up being repurposed into different projects.

A game in developement can also end up being vaporware, a term for projects that are announced on which development is started but, for a possible variety of reasons, were never published.

Following is a list of cancelled Mario games and vaporwares. Both should not be confused with beta elements, elements from a game that are removed before release, or playable tech demos rarely intended to be turned into commercial products.