I created a Super Mario Bros Rom Hack based on the Chinese Legend, Journey to the West.

Play the Journey to the West Mario Rom Hack: [https://www.romhacking.net/hacks/6647/] (IPS File)

4-1's platform at the end sometimes doesn't load the first time, try approaching again and it will eventually.

Full NES game download: https://notin.tokyo/source/Journey.zip

Resources:

SMB High Level Disassembly:
https://www.romhacking.net/documents/...

MMC3 Guide:
https://archive.nes.science/nesdev-fo...
Search for "Operation:" and you'll find the specific guide

Header Guide:
https://github.com/bonimy/MushROMs/bl...
From what I can tell, the scenery and platform type bytes in the area header may be swapped from what this guide shows.

Title Editor:
https://www.romhacking.net/utilities/...

Title Editor Guide:
   • How to Edit the Title Screen in Super...  

File Icon by Astonish from NounProject.com