Let me fill you in, friend...
Wikipedia info: A second edition of the game, titled
Ninja Gaiden Black, is currently available in stores. It is essentially a
Director's Cut of the original Xbox release of
Ninja Gaiden. It features two new difficulty settings (Master Ninja & Ninja Dog), much of the content from both "Hurricane Packs", tweaked enemy placement in the extra difficulties, four new costumes, the original arcade version of
Ninja Gaiden, a new mission mode with 50 short missions(including 5 from the previous "Hurricane Packs") involving scenarios not found in the core game itself, one longer and more challenging mission called "Eternal Legend" (unlocked after beating 40 of the missions), and several new in-game cutscenes. Some of the additions to the game are not readily apparent. Many are only available after being unlocked by progressing through the game at various difficulty levels.