Maybe a specific version of ROM is needed?
EDIT: "World" version works fine for me. Are you using the Duck Hunt combo rom?
Yeah, I just tested it using a rom named "Super Mario Bros. (W) [!].nes" and it worked fine.
Ah, shoot, that was it. I had "Super Mario Bros (E)".
I would've thought the patcher would've complained if the hash of the source rom was wrong woops. "Super Mario Bros. (Japan, USA)" worked.
Lmao I am so bad at SMB's weird jump uh ...physics.
