Well, after Mario rescued Princess and brought peace to Jeansowaty's Land... he decided to go on a 1-life journey through World 9. This is the direct follow-up to Jeansowaty Levels and features only 5 levels... 1-1 is a warp zone to World 9, which has 4 levels, like in SMB2j. World 9 works properly as a new world, and as such the Bowser in 9-3 will change into something different upon killing him.
V2
This has been redone from scratch in GreatEd and HxDen. The levels received many fixes which were well deserved. The .zip file contains the link to both the old version and the current V2.
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698