Ninja Gaiden - Dragon Sword - Platform: Nintendo DS

Completion bonuses:
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Successfully complete all chapters to unlock the "Prizes" option and Hard 
difficulty. The "Prizes" option allows you to view intermission sequences, 
letters, and character files that were found during your game session. Most 
are unlocked during the game by shooting the birds that appear when you use 
the microphone when a bird sound is heard.

The Way Of Kunoichi mode:
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Survive the fight with Ryu, and defeat the dragon Boss on the Hard difficulty 
to unlock The Way Of Kunoichi difficulty. In this mode, you will play as Momiji 
for the entire game.