Cheat Codes
     Hold  [C]  and  [Z], and enter the button combinations in under 3
seconds each in the Title Screen.

Get all normal items
     [Up],  [Left],  [Down],  [Right],  [Up], [Left], [Down], [Right],
[Right], [1], [2]

Get all secret items
     [Up],  [Right],  [Down],  [Left],  [Up], [Right], [Down], [Left],
[Left], [1], [2]

Get full sword gauge
     [Up],  [Down],  [Up],  [Down],  [Left], [Right], [Left], [Right],
[Right], [1], [2]

Max items
     [Down],  [Up],  [Down],  [Up],  [Right], [Left], [Right], [Left],
[Left], [1,]

Unlock all missions/assignments
     [Left],   [Left],  [Left],  [Left],  [Right],  [Right],  [Right],
[Right], [1], [2]


Unlockables

Ancient Hissatsu Techniques:  Complete 30 Assignments

Colored Rice:                 Complete 50 Assignments

Concept Art Gallery:          Complete 10 Assignments

Devil's Mask:                 Get all 20 mask pieces in Shadow Mode

Izayoi (Rikimaru's 
Unbreakable Sword):           Get all of the map pieces 
                              in stages 1 through 5, and 10

Memories (Video Gallery):     Complete 40 Assignments

Ninja Tabi '08:               Complete Story Mode

Onibi (Ayame's Unbreakable 
Sword):                       Get all of the map pieces 
                              in stages 6 through 9

Sound and Music:              Complete 20 Assignments