Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
Yoshi's Island 7. (I suck at level names...)
If the link doesn't work, try this one.
I couldn't wait for someone to answer, so I didn't change the OW to make sure that nothing's wrong. But the level still has a secret exit. It's nothing too fancy, but I think I did quite a good job.
Am I going to be disqualified for editing the title screen, level C5, level C7, and the YI overworld? I simply reduced them all to black screens by deleting all content, except for placing Mario out of view on C5 and C7. I don't see a reason why anyone would need to be picky about removing the extra shit, considering I'm doing it to get it out of my way, since the repetitiveness of seeing it every time I run my ROM sickens me.
Well, my level is about 2/3 done, but I wanted to compliment everyone who's submitted theirs already on their levels. Most are very nice, although a couple clearly could use some tweaking. Good Luck everyone!
Dotsarecool, check your IPS... it wasn't working with my unmodified rom.