Codes:

Legend:

     ^ is triangle. 
     [] is square. 
     O is circle. 
     X is cross. 

The following cheats are available at any time during gameplay only:
Enable Cheats - This code enables all of the following gameplay cheats - R2, ^, R2, ^, O , X , []. 

     Full Chi Cheat - This code fills the player's chi bar - R2, ^, R2, left, right, []. 
     Stealth Cheat - This code will make the player invisible to enemies - R2, ^, R2, left, right,
     R2. 
     Double Size Enemies Cheat - This code will make all enemies appear twice their normal size -
     R2, ^, R2, left, right, up. 
     Half Size Enemies Cheat - This code will make all enemies appear half their normal size -
     R2, ^, R2, left, right, down. 
     Nine Lives Cheat - No matter how many times the player is killed he will always have 9 lives
     - R2, ^, R2, left, right, X.