Kaizo Mario World, the most hardest Super Mario World game in the entire Super Mario World ROM Hacking community.
For those who don't have the ROM, I have the download link!
If it expires, let me know.
(Download link: http://tinyurl.com/huc874f)
UPDATE: Kaizo Mario 2 and 3 are up in the description:
Kaizo Mario 2:
Kaizo Mario 3: http://www.mediafire.com/download/g20q874yvvbqbws/Kaizo+Mario+World+3.smc