Ninja Gaiden: Dragon Sword Cheats

Clear game benefits
Artwork: Beat the game once.
Hard difficulty level: Beat the game once.

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.

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. Begin a new game to access it.

Happy Birthday from Team Ninja
If you have set the DS to your birthday, you will get a special "Happy Birthday" sound effect when you start the game! Instead of the usual sound effect when you tap the start screen, you'll hear one of the characters yell out "Happy Birthday!"