Ninja Gaiden was first released for the MS Xbox in 2004. Later it has been re-released under the title "Ninja Gaiden: Black". The original version from 2004 has been censored for it's international release. This regards the UK and every other European version. Furthermore the Japanese version. It seems like only the US Version of the original was uncensored.
However, the later "Ninja Gaiden: Black" re-release was uncensored. This regards the US version as well as the international version.
In 2007 the Game has been re-released once again. This time exclusivly for the PS3 as graphical enhanced version. This version is called "Ninja Gaiden: Sigma". The story for this version is the same like with the original version from 2004: Only the US-Version of "Ninja Gaiden: Sigma" is uncensored. Every other version only includes the censored version.