All story mode missions
At the mission selection screen, press White(2), L, R, Right, X, click Left Analog-stick, click Right Analog-stick.
Bonus Rikimaru stage
At the title screen, press White, Up, Black, Down, L, R, Left to unlock Rikimaru's Through The Portal bonus mission. Alternatively, successfully complete the game with all three characters.
All mission layouts
At the mission selection screen, click Right Analog-stick, click Left Analog-stick, press L, R, White, Black.
All characters
At the title screen, hold White + Black and press Up, Right, Left, Down. Then, release White + Black and press L + R. All multi-player mode characters will be unlocked, as well as Tesshu in story and co-op modes.
All items
At the item selection screen, hold L + R and press Up, Down, Up, Down, X(3), Left, Right, Left, Right, X(3) to unlock .
Increase items
At the item selection screen, hold L + R and press Up, Left, Down, Right, X(3).
Infinite item capacity
At the item selection screen, hold L + R + White and press Up(2), Down(2), Left, Right, Left, Right. Although you can only still carry six different items, you can have an unlimited amount of those specific items.
Full health
Pause the game and press Up, Down, Up, Down, X(3).
Full Kuji
Pause the game, then hold L + R and press Left(3), Right, X.
Add one Kuji to meter
Pause the game and press Left(3), Right, X.
Toggle special abilities
Pause the game, then hold R + Black and press Up(2), Down(2). Release R + Black and press X(2), L.
Increase offensive power
Pause the game, then hold R + White and press Up, Down, Up, Down. Release R + White and press X(3) to increase your offensive power five times.
Increase score
Pause the game, then hold White + Black and press Right(3), Left to add 100 points to your score.
Display score and time
Pause the game and press Right(3), Left.
B-side dialogue
At the title screen, hold L + R and press Down, X(2), Up, X(2), Left, X(2), Right, X(2). Alternatively, successfully complete all Rikmaru and Ayame's missions with a "Expert Ninja" rank and Tesshu's missions with a "Professional" rank. Enter the options screen and select "Audio", then "Language". Select the "B-Side" option to play the game with joke and outtake-style dialogue. Note: This is only available in the North American and European version of the game.
Play as Tesshu
Successfully complete the game with Rikimaru and Ayame to unlock Tesshu.
Play as Ninja Dog in multi-player mode
Get a "Grand Master" rank on all of Ayame's missions to unlock Ninja Dog in multi-player mode.
New items
Get a rank of Grand Master on a level to unlock new items. The item is different for every level.
Easy kills around corners
When you have your back against a wall and are peeking around a corner, if there is a guard there, toss a poison rice ball (the one with the green leaf) by pressing Y. As soon as the guard picks it up, run around the corner and Stealth Kill. It does not matter if he is facing you, but try to kill him before he eats it. By doing this you can use the same rice ball on multiple guards.
