To clarify: The classic Ninja Gaiden (2004) was developed by Team Ninja and released exclusively for Xbox, later ported to PlayStation 3, Xbox 360, and various other platforms, but never to PS2.
: Any "ISO" files found online today for PS2 are typically fan-made projects , such as the Ninja Gaiden Trilogy HCK Edition , which is a fan-compiled collection of the original 8-bit NES games modified to run on PS2 hardware via emulation. Legitimate PlayStation Alternatives Ninja gaiden ps2 iso