Key: T=triangle S=square X=X
C=circle SL=select ST=start U=up D=down R=right L=left,
R1,R2,L1,L2 are same.

Tenchu Cheats:
Debug Mode: Pause game, hold L1+R2 and press U,T,D,X,L,S,R,C.
Release L1+R2 and press L1,R1,L2,R2. Wait a moment, then
press ST followed by L2+R2. A debug menu that allows
invincibility,secret weapons,enemy summoning,toggle enemy AI,
FMV skip,and other effects will now appear.
The following may also be done in the debug menu:

Frame by frame: Enable any Debug option, then pause the game
and tap SL to move through the game frame by frame.

Two Player mode: use enemy option in debug menu to select any
opponent. Then, select the "Pad-2" option to enable a second
player. Move away from the newly created player until a
Question mark appears near the health bar. Run back towards
the newly created player. Both controllers may now be used to
play the game. NOTE: If either player leaves the screen, the
second playerwill be cancelled

Restore health:Pause the game and press L,L,D,D,S,S,T,S

Level Select: Select a character, then at the mission select
screen, hold R2 and press L,L,D,D,S,S,T,S

Layout Select: select a character, then at the mission select
screen, hold R1 and press L,L,D,D,S,S,T,X

Enable Japanese Voices: slect a character, the at the mission
select screen, hold L1 and press L,L,D,D,S,S,T,C. NOTE:
Japanese voice effects will start after the first level; the
narrative will remain in English.

All weapons: at the item select screen, hold L1+R1 and press
X,T,S,T,S,C. Then, release L1 and press L1 again.

Carry 99 items: at the item select screen, hold L1 and press
L,L,D,D,S,S,T,S

All Items: at the item select screen, hold R1 and press
L,L,D,D,S,S,T,C

Increase item inventory: at the item select screen, hold L2
and press L,L,D,D,S,S,T,X. Every time you enter the code,
your item inventory number will increase by 1.

Ayame sexy armor: at the item select screen, press
L,L,D,D,S,S,T,C. The armor icon will automatically be
selected.

Alternate costumes: select either Rikimaru or Ayame, the
successfully complete any level without being spotted or
killing innocent people. If done correctly, a "Grandmaster"
screen will appear after the level is completed. To use the
alternate costumes, start the next level. When the item
select screen appears, look to the right shelf. If the object
that appeared on the "Grandmaster" screen is available,
select it to give Rikimaru or Ayame a new set of clothes.

these codes are for Tenchu 2(Strategy By: Geoffrey Pekens and Edward L. Trevenen)

Unlock All Ninja Items

Item Selection Screen: Press Square, Square, Square, Circle, Square, Circle, Circle, Left,
Up, Down, Right, R2, R2.

Increase Item Inventory by 1

Item Selection Screen: Hold R1 and Square and press Right, Down, Left, Up.

Show Entire Map

In-Game: Hold Select to view the map and press Circle 5X.

Unlock All Missions for Available Characters

Stage Selection Screen: Hold Circle, Square, and Select and press Right, Right, Right, Up,
Left, Down, R2.

Unlock all Missions in Mission Editor

Custom Mission Selection Screen: Hold R2 and Circle and press Up, Down, Down, Right,
Left, Left.

Copy Missions off of CD in Mission Editor

Mission Settings Menu: Hold Circle and press Up, Up, Down, Down, Left, Right.