So I was looking through the xbox 1 million sellers list, and I was astonished by how little japanese productions were actually sold on the system. I then noticed I saw no ninja gaiden, and yet I believe the original version alone sold nearly 700k in the US, nearly 100k in japan, and combine europe and of course, the release of black, and you probably have a decent seller if nothing else.

Does anyone have figures for this game combined with the OG and black versions? I would like to not only compare them to sigma, but also to the eventual NG2.

Thanks     

Well it would be best to contact ioi about that. ioi is the co-owner of this site. Message him, and really Ninja Gaiden data isn't all that important, the American data isn't up for Ninja Gaiden so your going to have to wait like me and the others.

There's data missing for a lot of games.  Way of the Samurai 1&2, Killzone, among others.