Recently it came to light that some people who had created Super Mario Maker levels found that their levels were being deleted from the game, though no reason was given for why that was happening. However, thanks to new information on the game’s support page we now have reasons for the level deletions.
Below you will find a list that was provided by Nintendo that brakes down exactly why some levels are being removed from Super Mario Maker:
Low stars/plays – After a fixed period of time, courses with low stars/plays will be automatically deleted from the server.
Bugs – Courses that include bugs that were unintended by either the course creator or the developers will be deleted. It’s important that we remove levels with bugs quickly, because letting these levels remain in Course World can lead to negative outcomes for many players such as players experiencing levels in unfair ways that the original course creator did not intend, or re-writing “World Record” times.
Requesting stars from other users – Courses that are explicitly asking for stars from other players will be deleted. For example, using words such as “Like”, “Yeah!”, and the “★” symbol in their course names. Please change the course name when saving a course that includes these words.
Inappropriate Content – Courses that contain something inappropriate, such as offensive language or phrases will be deleted.
The page then notes that additional violations beyond the first may result in further penalties from Nintendo.