This is where the phrase is born. These are games that do not exist on pressed DVDs. They exist only as loose XEX folders shared on development kits (XDKs) or internal Microsoft builds.
Thousands of XNA games were released on Xbox Live Indie Games (XBLIG). Most are lost because the Xbox 360 Indie store shut down in 2017. Their only remaining form is the XEX file. xex xbox 360 games exclusive
These titles remain playable only on Xbox 360 hardware (or through backward compatibility on newer Xbox consoles) and have not been officially ported to other platforms like PlayStation or PC. Ninja Gaiden II This is where the phrase is born