Thousands, maybe millions of Mario Maker levels have been made, that is a lot but can Nintendo really store that many? No, no they can not and Nintendo has made it clear that any low popular/inactive levels will be deleted:
Low popularity isn't made very clear, but apparently this is...
About every Sunday or at least once a month, I'll go through some of your Mario Maker levels or some random people's courses, give it a try and then record my official attempt at the stage.
If you want me to really record your level, you must be a member here on this forum that has either 100...
Next week on November 4th 2015, the Mario Maker game for the Wii U will be getting a large update.
The update includes mid level checkpoints (wait, this wasn't in it from the start?) along with new Course World categories which will let Nintendo highlight specific levels created by both...