The Second "Super" Super Mario Land (Hack)
Developed by Frank... I mean, Mallory P. Maggiore (huh).
Click "Show More" for a download link.
From RHDN:
"This hack changes all the levels of Super Mario Land, for both normal and hard mode. The game is a fair bit more difficult than the original game, especially for hard mode. There are also a few minor graphics changes."
Link (get it while you still can): https://www.romhacking.net/hacks/8046/