So, I like Mario games.
Particularly スーパーマリオブラザーズ2. So I decided to take Super Mario World, castrate it, and made it how I wanted. It's not finished, but you can play it.BPS Download
You will need a patching tool such as Alcaro's Flips. Your ROM should be md5:
e0deebd3c3f560212af17c68b9344bae. I can not provide this for you, you need to dump your own game.