Tecmo announced that Ninga Gaiden Sigma (AkA Ninja Gaiden Shiguma) has shipped 500,000 copies worldwide. Not bad for a remake of Xbox game Ninja Gaiden Black — especially considering the game has been out for a mere two months in Japan and about a month elsewhere. Thank Rachel and her big Blades of the Ouroborus.
Ninja Gaiden Ships Half a Million [Siliconera]