Cheat Menu:
Pause the game & hold L1 + R2. Press Up, Triangle, Down, X, Left, Square, Right, Circle. Then release L1 + R2 & press L1 + L2 + R1 + R2. Then hit Start. Press L2 + R2 to open a cheat menu.

Refill Health:
Pause the game & press Left, Left, Down, Down, Square, Square, Triangle, Square.

Level Select:
Select a character, then at the mission select screen, hold R2 & press Left, Left, Down, Down, Square, Square, Triangle, Square.

Layout Select:
Select a character, then at the mission select screen, hold R1 & press Left, Left, Down, Down, Square, Square, Triangle, X.

Japanese Voices:
Select a character, then at the mission select screen, hold L1 & press Left, Left, Down, Down, Square, Square, Triangle, Circle. Note: The Japanese voices will start after the first level; the narrative will remain in English.

Carry Up To 99 Items:
At the item selection screen, hold L1 & press Left, Left, Down, Down, Square, Square, Triangle, Square.

All Inventory Items Available:
At the item selection screen, hold R1 & press Left, Left, Down, Down, Square, Square, Triangle, Circle.

Increase Item Inventory:
At the item selection screen, hold L2 & press Left, Left, Down, Down, Square, Square, Triangle, X. One more of each item will be available every time this code is entered.

Alternate Ayame Costume:
At the item selection screen, press Left, Left, Down, Down, Square, Square, Triangle, Circle. Then, the armor icon will automatically be selected. Now begin the game & Ayame will be wearing her 3^rd costume.

Debug Mode:
Pause a game, then hold L1 & R2 & press Up, Triangle, Down, X, Left, Square, Right, Circle, release L1 & R2, then press L1, R1, L2, R2. The pause message should disappear & then you should hit Start. Now press L2 & R2 together to access a debug menu, where you can alter all kinds of in-game stuff. You can even create & save new level layouts.