The Super Mario Bros: Game Master Levels Database was created in December of 2010 in order to allow people to easily upload and share their creations with the world. Due to how old and outdated this game is, the Super Mario Bros: Game Master Levels Database has been shut down. The User Created Levels download contains all levels that were uploaded to the official Super Mario Bros: Game Master Levels Database. Each folder in this download is named after the user that uploaded the file. To play these files, you need to extract the .lvl files to the Level folder, the .wld files to the World folder, and the MIDIs to the Music folder. Have fun!