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.
In this hack your objective is to collect 99 coins in each level. Each level has its own gimmick, such as automatically walking forward, everything being frozen and Mario having infinite fire-flower but limited ammo, a literal metroidvania level, medium auto-scroller with infinite winged Yoshi and an Warioware rip-off.
This new version adds five more levels, one level 90% remade with new gimmick, and lots of improvements to old levels. And it finally has an name too!
Version 1.4 changes:
Many improvements and changes, see readme for full list.
Its by pulsar, download link doesn't seem to work anymore but heres mirror: https://bin.smwcentral.net/u/25888/Noma%2Bbrain%2Bpower%2Bby%2Bpulsar.zip
No idea about the crashing issue, it never crashed on me when testing on snes9x and real hardware with super everdrive, and neither for patcdr who tested it on his snes and sd2snes flashcard. But the patch I used for it is abandoned alpha so there isn't much I can do about it, I did put request for better/modern version of it but so far nothing .