Debug mode
pause game, then press & hold L1+R2 and press Up,triangle,x,<-,square,->,O. Now, let go of L1+R2 & press L1,R1,L2,R2, unpause and press L2+R2


Level select:

Enter the load/save menu at the map screen. Next, hold R1 and quickly press Up, Down, Square, Up, Down, Square, Up, Down, Square, Down, Up, X.

Play as Tatsumaru:
Beat the game with both Rikimaru and Ayame.

More options in mission editor:

The farther you reach in the game, the more options you get in the mission editor. You can use the same tilesets in the mission editor from the current mission you are playing

Unlock All Ninja Items:
At item selection screen, press Square, Square, Square, Circle, Square, Circle, Circle, Left, Up, Down, Right, R2, R2.

Increase Item Inventory by 1:
At item selection screen, hold R1 and Square and press Right, Down, Left, Up.

Show Entire Map:

During the game, hold select to view the map and press Circle five time.

Unlock All missions in Mission Editor:

At Custom Mission screen, hold R2 and Circle and press Up, Down, Down, Right, Left, Left.

Copy Missions from Cd in Mission Editor:
At mission settings menu, hold Circle and press Up, Up, Down, Down, Left, Right.

Office tileset:

At the mission editor and select "Edit Mission." When you highlight the "New Mission," hold L2 and press Circle, Square, Left, Right, Circle, Square.

Get Tatsumaru-without beating game:

At the level select screen, hold Square + Circle and press R1, R2, L2, L1, Up, Down, Left,Right, Select. This code is the Alternate way of getting Tatsumaru without having to beat the game with Ayame,and Rikimaru. (if there is a problem, Try putting in the level select codes in for each Character first, then this code, I put it in after that,but it may work without it)

Regain health:
Pausing the game and holding square, and then pressing Left, Right, Up, Down will restore your health. Hints:

High jump
If you are in certain levels (Quarantine Village, Laborers), you do not need a grappling hook to get on to the roof of a house. Run up to the wall, face it, and jump. Your character will jump twice the normal height of the usual jump and land on top of the roof without hanging on the side.

Easy kills
Hit an enemy who is not aware of your presence in the head with a blow gun dart to automatically kill them.

Automatic stealth kill
You do not need to pull out your weapons to perform a stealth kill. Run to the enemy and press Attack. Your weapons will instantaneously be drawn out, and you will perform the stealth kill.

Stealth kills
You can get the different stealth kills by being in the correct position in relation to the enemy.

Easy stealth kills
Sneak up from behind. Sneak up from behind and crouch. Jump on enemy, while pressing Attack in mid-air.

Moderate stealth kills
Sneak from the side.

Hard stealth kills
Sneak from front (or wait for them to turn around into you). Note: This must be timed perfectly.