Level Skip:
At memory card check, press L2, L2, L2, R2, R2, R2. The words 'Dels level skip on' will appear to bring up a level skip.

Invincibility and All items:
Pause the game and press L2, R2, L2 3 times, R2 3 times, Circle, Triangle, Square, Circle, Triangle, Square. If you entered the code correctly, you will hear a chime and the ninja will turn into a skeleton. Now you will be invincible with infinite items and lives. Repeat the code to turn back into the ninja while keeping the extra items.

Weapon Select:
Pause the game and press R2 3 times, L2 3 times, R2 3 times, L2 6 times. Now resume the game to have a new weapon. Repeat the code for a different weapon.

Decrease Boss Energy:
Pause the game while fighting against a boss and press L2 3 times, R2 3 times, and Triangle 6 times to dramatically reduce the bosses energy level.

Baby Mode:
When "Start" flashes, press L2 3 times, Select 3 times, and R2 3 times.

Big heads, hands, feet:
Press Select, Select, Select, L2, L2, L2, Select, Select, Select when "Press Start" flashes at the title screen.

Get The Sword:
At the main menu, press Left, Right, Right, Up, X, X, Square and you should get the sword.

Weaker Boss:
Pause game play during a fight with a Boss. Then, press L2 3 times, R2 3 times Triangle 6 times.

GameShark Codes

Infinite Health	    8006d09e0050
Infinite Lives      8002c0522400
Infinite Bombs      8006d07c0009
Infinite Magic Potions	8006d0a00009
Silver Key          8006d01c0001
Gold Key            8006d0340001
Infinite Money      8006d044ffff
Max Power Up        8006d0180004
                 
Note: The following codes will make the FMV lock. 
Skip all movies to use these codes.

Have Katana	        8006ad2a0004
Have Ultimate Sword	8006ad2a0200
   

Thanks to Revolution readers Steven Kusuma, Stevie Hagerman, Tom Anderson, Andrea B., Raptor330, Kurosawa, Zero Cool, Richard Hess, Clint Jackson, Joseph Roy, Eric Kruttschnitt, Jeremy Elkins, Jaime, Mike Frank, Casey Truitt, and Mike H.!