: To ensure all shared levels are beatable, the game requires creators to "clear check" their levels from the start and from any checkpoints before they can be uploaded to the community server.
The team behind the World Engine has stated that 4.0.0 is not the final version. On their roadmap for (ETA unknown): super mario maker world engine 4.0 0 apk
: Attach twisters to make enemies fly, or add grinders to moles. : To ensure all shared levels are beatable,