Backgrounds? Urbz

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The only other option I could think of would be to hunt down the palette, tileset and map data within the rom, but unless you know what you're looking for, chances are you won't find anything. Considering most games use LZ compression for these things, that makes it only harder. Even if you'd find the data, you'd still have to match palettes, tiles and maps together...

I'd suggest to rip what you can and leave blanks where you couldn't reach something.