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Playstation 2 - Ninja Assault cheats

Chapter 2 - Mission mode
Finish Guren's Chapter in story mode.

Chapter 3 - Mission mode
Finish Gunjo's Chapter in story mode.

Chapter 3 - Mission mode
Finish Aoi's Chapter in story mode.

Chapter 5 - Mission mode 
Finish the game in story mode.

Last chapter - Mission mode
Finish every chapters in mission mode.

Fireworks mini-game training mode
Reach the top score in story mode

Unlock Magnum
Finish the Last Chapter in mission mode 

Unlock Shotgun
Reach an "S" rank in every bonus training missions