Tenchu: Return From Darkness 
  
Xbox
  

During play, pause the game and enter the following:
Restore health:


  Up,
Down, Up, Down, X, X, X. 
 Show score:


Right, Right, Right, Left. 
One extra  Kuji:


  Left, Left, Left, Right, X
Full Kuji:


      Hold L + R and press Left, Left, Left, Right,
      X.
100 extra points:


Hold White + Black and
press Right, Right, Right, Left.
New move:


Hold R + Black and press Up, Up, Down, Down. Release R + Black and press
X, X, L, R. 
Stronger  offense:


Hold R + White and
press Up, Down, Up, Down. Release R + White and
press X, X, X.





Enter the following at the Title Screen:
All characters:


  Hold White + Black and press Up,
  Right, Left, Down.
  Release White + Black then press L,
  R. 
Through The Portal extra mission:


White, Up, Black, Down, L, R, Left 
 B-side audio:


  Hold L + R and press Down, X, X, Up, X,
  X, Left, X, X, Right, X, X. Now go into the Options menu and select Audio/Language
  to find the new B-side option. 

Enter the following at the Mission select screen: 
All story mode missions:


 White, White, L, R, Right,
X, click left stick, click right stick 

All layouts:


Click right stick, click left stick,
 L, R, White, Black


Enter the following at the Item select screen: 
All ninja items:


  Hold L + R and press Up, Down,
  Up, Down, X, X, X, Left, Right,
  Left, Right, X, X, X. 

Increased ninja items amount:


Hold L + R and press Up, Left,
Down, Right, X, X, X. 

Infinite  capacity:


Hold L + R + White and press Up, Up,
Down, Down, Left, Right, Left, Right,
 release White and
press X, X, X.




Thanks to Revolution readers Jumanji, wallace gromit, farrah and Jake676!