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 be reused in commercial releases, and some cancelled games are repurposed into different projects.

A game in development 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.