Unlimited health:
Hold L + R and press Up, Right, Up, Left, Down, Left, Down, Right at the screen 
with the "Story Mode" and "Challenge Mode" options. A message will appear to 
confirm correct code entry. 

Unlimited combo meter:
Hold L + R and press Left, Right, Down, Up, Up, Down, Right, Left at the screen 
with the "Story Mode" and "Challenge Mode" options. A message will appear to 
confirm correct code entry. 

All upgrades:
Hold L + R and press Down, Up, Down, Left, Down, Right, Up, Down at the screen 
with the "Story Mode" and "Challenge Mode" options. A message will appear to 
confirm correct code entry. 

All bonuses:
Hold L + R and press Left, Down, Left, Right, Left, Left, Down, Right at the screen 
with the "Story Mode" and "Challenge Mode" options. A message will appear to 
confirm correct code entry. 

Dark Knight difficulty setting: 
Hold L + R and press Right, Up, Up, Right, Left, Down, Right, Up at the screen with 
the "Story Mode" and "Challenge Mode" options. A message will appear to confirm 
correct code entry. 

Making Of Sin Tzu:
Defeat Sin Tzu at the end of the game.

Alternate costume:
Successfully complete the game under the easy difficulty setting.