Get The Sword:
At the main menu press Left, Right, Right, Up, X, X, Square.

Invincibility:
While the game is paused press L2, R2, L2, L2, L2, R2, R2, R2, Circle, Triangle, Square, Circle,
Triangle, Square. If done correctly you will hear a chime and the ninja will turn into a skeleton. Just
do the code again to change back.

Level Select:
Load a game and while Checking Memory Card appears, press L2, L2, R2, R2. You will now
have a level select screen when the game starts.

Random Weapon:
While the game is paused, press R2, R2, R2, L2, L2, L2, R2, R2, R2, L2, L2, L2, L2, L2, L2.
Resume the game and you've got a new weapon. Repeat for multiple weapons.

Baby Ninja Mode:
As START flashes press L2, L2, L2, Select 3x, R2, R2, R2.

Less Boss Energy:
While engaged combat with a boss, pause the game and press L2, L2, L2, R2, R2, R2, Triangle
(6x) to weaken his energy.

Big Head Mode:
When "Press Start" flashes at the title screen Press Select, Select, Select, L2, L2, L2, Select,
Select, Select.