Use the following key when entering the passwords:

L: Leonardo
M: Michaelangelo
D: Donatello
R: Raphael
S: Shredder

Enter DSRDMRM as a password. Your character will always have full health. Note: This code has no effect in the tournament modes.

Enter LSDRRDR as a password. Your characters will no longer be hurt by damage.

Enter DRMSRLR as a password. Your character will slowly regain HP. Note: This code has no effect in the tournament modes.

Enter DRSLLSR as a password. Your character will slowly lose HP. Note: This code has no effect in the tournament modes.

Enter MRLMRMR as a password. All health items will be replaced by full HP pizzas. Note: This code has no effect in the tournament modes.

Enter SDLSRLL as a password. Your attacks will be doubled. Note: This code has no effect in the tournament modes.

Enter SLSDRDL as a password. All enemies will have their attacks doubled. Note: This code has no effect in the tournament modes.

Enter LDRMRLM as a password. Your defense will be doubled. Note: This code has no effect in the tournament modes.

Enter RDSRMRL as a password. All enemies will have their defense doubled. Note: This code has no effect in the tournament modes.

Enter RSRLRSM as a password.

Enter RLMRDSL as a password. Your Shuriken will be disabled. Note: This code has no effect in the tournament modes.

Enter LRSRDRD as a password. Enemies have one-hit kill ability. Note: This code has no effect in the tournament modes.

Enter SDSDRLD as a password. You will lose all health after falling. Note: This code has no effect in the tournament modes.

Enter MLDSRDM as a password. Alternate sounds will play when objects are hit. Note: This code has no effect in the tournament modes.

Enter SSSMRDD as a password. Alternate sounds will play when you walk. Note: This code has no effect in the tournament modes.

Enter MRMDRMD as a password. Stamina restore will no longer be available.

Enter DSLRDRM as a password.

Enter LMRMDRD as a password.

Enter MLMRDRM as a password.

Enter RMSRMDR as a password.

Enter SRMLDDR as a password.

Win the Open Brawl Tournament. Alternately, Casey Jones is unlocked five days after a saved game file is created; you can change the system date to do this. Casey Jones replaces Raphael.

Defeat Karai in the Foot Fight Tournament in less than 150 seconds. Alternately, Karai is unlocked thirty five days after a saved game file is created; you can change the system date to do this. Karai replaces Michaelangelo.

Win the Battle Nexus Tournament. Alternately, Slashuur is unlocked forty five days after a saved game file is created; you can change the system date to do this. Slashuur replaces Leonardo.

Successfully complete level 11-7. Alternately, Splinter is unlocked ten days after a saved game file is created; you can change the system date to do this. Splinter replaces Donatello.

Use the following trick to unlock all hidden characters at once. Make sure you have a saved game file for the game. Set the system date two or more months ahead from the date that you saved the current game. Insert the game disc and start it. At the title screen, go to "Continue Game". When you get to the level selection screen, go to "Home". You will see all playable character unlocked. To confirm to the game that you have unlocked the hidden characters, just exit home, start any stage, and complete it. When you have finished, the game will confirm that you have unlocked the hidden characters, as well as other cheat codes.

Got to level 9-1 and get the hidden Antique. Do this by going down one of the alleyways. There will be a pile of crates and a broken down bus. Jump on the crate and onto the bus. From the bus, jump onto the building . There should be two crates here, containing Pizza and the Antique. Then, complete the level and defeat all the Purple Dragons, Foot, and Mobsters. Next, go to the " 2nd Time Around". If you look through the different objects in the "NY" section, you will see the image of an arcade. Select the arcade to see information on it. When you exit out of the information, the message "Classic Arcade Mode Unlocked" will appear, and that option is now on the main menu at the title screen. Note: Do not worry if the screen remains black, or the arcade main screen takes a long time to load; this is normal.

In the arcade game, press X to get more lives instead of quarters. The joystick and certain buttons including the pause feature do not work. The character selection is just like the arcade. Each controller controls a different turtle. You cannot choose which turtle to assign to a controller. Controller one is Leonardo, controller two is Michaelangelo, controller three is Donatello, and Controller four is Raphael.