Since all those cool aliens and items and map objects and tiles in the correct art style are just sitting there, I though I'd ask. Are there any file format differences in terms of how sprites are handled or other hidden stumbling blocks? I also know that the two games handle palettes differently, so any advice on how to deal with that as a complete noob would be appreciated!
And finally, does anyone have any advice on colour swaps (changing the colour of lobstermen and switching the sonic weapon sprites to a base colour of dark grey rather than blue-green are my best examples)?