Ninja Gaiden: Dragon Sword Cheats - Nintendo DS
Artwork - Beat the game once.
Hard Difficulty - Beat the game once.
The Way of Kunoichi
To play through the enitre game as Momiji, select the hard difficulty level, survive the fight with Ryu and successfully defeat the dragon boss. A new difficulty will be unlocked - The Way of Kunoichi. Start a new game to access it.
Unlock Master Ninja mode
Beat the game on hard to unlock Master Ninja mode.
Unlock Muramasa's prize shop
Beat the game once on Normal to unlock Muramasa's prize shop.
Easter Egg: Happy Birthday Message
If you have set the DS to your birthday, you will get a special "Happy Birthday" sound effect when you start the game! Also, when clicking on the start screen, you'll hear one of the characters yell out "Happy Birthday!"