I have played a few NES ROMs where people have gone into them and changed the sprites. How did they do this?
I'd like to do this for the Double Dragon ROM. How can I accomplish that?
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Just to extract an answer from the comments:
To use this you need the Extractor executable and the Inserter. Use the extractor to get the tiles first, edit them in your editor of choice (MS Paint ftw) and then use the inserter to pop them back into the ROM. Make sure you create a backup in-case it corrupts the ROM image.