What logic do you use for animations? Bank swapping? If so, you must have done a mapper change, MMC3 maybe?
Mapper 3 - VROM (CHR) Switch / CNROM.
Yes. It's a animation patch:
Once patched, they will be three extra sprites sheets (4 in total), so that you can edit the sprites. You can't open the hack in SMB Utility after patching this.
Author of the patch: Masa&Yuu
So what I did was to repurpose vertical ropes of balance lifts into waterfalls.That's fine and all, but the waterfalls would be brown because they (ropes) share palette with the ground. I had the hardest time separating the palettes!
This is a perfect example of how cryptic this game can be to hack. I have got access to A Comprehensive Super Mario Bros Disassembly and still I could not find a simple way of just assigning a new palette to ropes.
So what I had to do was to take out the top of the cloud metatile (because thats's a different palette). ROM adress: 139A. And put it in the ropes metatile adress: ROM 0BBC. And that affected the bushes so I had to switch metatiles for bushes as well. That alone took me a week, but at least I'm learning stuff.