At item selection screen, hold R1 and press Left, Left, Down, Down, Square, Square, Triangle, Circle
All ninja tools
Equip armor at item screen then enter left, left, down, down, square, square, triangle, circle
Alternate Ayame Armor
Pause the game, hold L1 + R2 and press Up, Triangle, Down, X, Left, Square, Right, Circle, then release L1 + R2 and press L1, R1, L2, R2, then wait a bit and press Start, L2 + R2
Debug Mode
At the select stage menu hold R1 and press Left, Left, Down, Down, Square, Square, Triangle, X
Enable enemy layout selection screen
At the items menu hold L1 and press Left, Left, Down, Down, Square, Square, Triangle, Square
Increase item capacity to 99
At the item selection screen hold L2 and press Left, Left, Down, Down, Square, Square, Triangle, X
Increase Items
At the mission select screen hold L1 and press Left, Left, Down, Down, Square, Square, Triangle, Circle
Japanese Voices
Pause the game and press Left, Left, Down, Down, Square, Square, Triangle, Square
Refill health
At the stage select screen hold R2 and press Left, Left, Down, Down, Square, Square, Triangle, Square