Keys lead to mandatory boss battles
In today’s Nintendo Direct, it was announced that Super Mario Maker will be getting an update on March 9. When making levels, you can now add keys to unlock doors to gate progression. These keys can be hidden or placed on enemies so that you can force your players into mandatory boss battles.
You can also add pink coins that have to be found before a level is complete, so you can be more devious when creating puzzles. The bookmark site will also add ranking categories for levels such as first completions.
Man, levels are gonna get crazy.