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Restore health

Pause the mission. Then press up, down, up, down, x, x, x.

All ninja items

At the item select screen hold down right and left triggers while pressing up, down, up, down, x, x, x, left, right, left, right, x, x, x.

Increase the amount of ninja items

At the item select screen hold down right and left triggers and press up, left, down, right, x, x, x.

Unlimited item capacity

At the item select screen hold down the right and left triggers along with the white button and press up, up, down, down, left, right, left, right. Release the white button and press x, x, x.

Unlock all characters

At the start menu hold down the white and black buttons while pressing up, right, left, down. Let go of the white and black buttons and press the left and right triggers. The cheat unlocks Tesshu for story and co-op mode + all 20 characters for multiplayer deathmatch.

Unlock all missions (in story mode)

At the mission select screen press white, white, left trigger, right trigger, right, x, left-click, right-click.

Unlock all layouts

At the mission select screen press right-click, left-click, left trigger, right trigger, white, black.

Increase offensive power X5

Pause the mission. Hold down right trigger and white button while pressing up, down, up, down. Let go of the right trigger and white button and press x, x, x.

Unlock Through the Portal

Use at the title screen. Press the white button, up, black, down, left trigger, right trigger, left. You have umlocked Rikimaru's bonus mission Through the Portal.

Unlock B-Side

Use at the title screen. Hold down the left trigger and right trigger while pressing down, x, x, up, x, x, left, x, x right, x, x.
Now go to "Options - Audio - Language" . If you own the North American or UK release you can now select a 3rd voice over option called "B-Side".

Get one kanji

Pause the mission. Then press left, left, left, right, x. Fills your Kuji-Meter by 1.

Fill the kuji meter

Pause the mission. Hold the right and left triggers while pressing left, left, left, right, x.

Unlock new special move

Pause the mission. Hold right trigger and black button while presssing up, up, down, down. Now let go of the right trigger and the black button. Press x, x, left trigger, right trigger.

Show score

Pause the mission. Press right, right, right, left.

Increase score

Pause the mission. Hold down the white and black buttons while pressing right, right, right, left. 100 points will be added to your score.

Ninja Dog Multi-player Character

Get a 'Grand Master' rank in all of Ayame's missions.

Semimaru Multi-player Character

Get a 'Grand Master' rank in all of Rikimaru's missions.

Different person in cut scenes

In order for this cheat to work you need to have the invisibility ninja item for Rikimaru and the the disguise ninja item for Tesshu(i suggest using the all items cheat). At the item screen select these items. When you get to the point before the cutscene use the the item and when the cutscene begins your character will either invisible(Rikimaru)or dressed as an enemey(Tesshu)note:this affect doesnt last very long.