an all-in-one Fossil Fighters ROM-hacking tool

click here to download the latest release of carbonizer

drag the .nds ROM file onto carbonizer.exe. a terminal window should appear while carbonizer runs, then close once it finishes. a folder will be created next to the input file that contains the unpacked ROM files.

carbonizer's output files can be edited using a regular text editor (I recommend Notepad++). To repack the edited files back into a .nds ROM, drag the folder onto carbonizer.

OVERVIEW: A Fossil Fighters ROM-hacking tool

By default, carbonizer automatically determines whether to pack or unpack each input. It does this by looking at file
extensions, magic bytes, and metadata

USAGE: carbonizer [--pack] [--unpack] [--auto] [--ask] [<file-paths> ...]

ARGUMENTS:
  <file-paths>            The files to pack/unpack

OPTIONS:
  -p, --pack/-u, --unpack/--auto/--ask
                          Manually specify compression mode (default: --auto)
  -h, --help              Show help information.

example:

carbonizer "Fossil Fighters.nds"

when carbonizer is run for the first time, it'll create a config.json file that configures certain aspects of carbonizer's behavior. it has comments explaining each option, but if anything is still confusing, let me know!

see this wiki for technical information on Fossil Fighters' proprietary binary formats.