Metal Wolf Chaos

 is a third-person shooter game developed and published by FromSoftware Studios on December 22, 2004 in Japan for the Microsoft Xbox.

New weapons were released through Xbox Live, but the content is no longer available with the discontinuation of Xbox Live support for the original Xbox on April 14, 2010.

There are unlock requirements for most of the weapons, but it's unclear if the DLCs have to be downloaded to make the weapons obtainable, or if the download allows to avoid those requirements.