Health
Enter DSRDMRM as a password. Your character will always have full health. Note: This code has no effect in the tournament modes.
Mighty Turtle
Enter LSDRRDR as a password. Your characters will no longer be hurt by damage.
Self Recovery
Enter DRMSRLR as a password. Your character will slowly regain HP. Note: This code has no effect in the tournament modes.
Poison
Enter DRSLLSR as a password. Your character will slowly lose HP. Note: This code has no effect in the tournament modes.
Pizza Paradise
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.
Super Offense Power
Enter SDLSRLL as a password. Your attacks will be doubled. Note: This code has no effect in the tournament modes.
Nightmare
Enter SLSDRDL as a password. All enemies will have their attacks doubled. Note: This code has no effect in the tournament modes.
Super Defense Power
Enter LDRMRLM as a password. Your defense will be doubled. Note: This code has no effect in the tournament modes.
Super-Tough
Enter RDSRMRL as a password. All enemies will have their defense doubled. Note: This code has no effect in the tournament modes.
Infinite Shuriken
Enter RSRLRSM as a password.
Lose Shuriken
Enter RLMRDSL as a password. Your Shuriken will be disabled. Note: This code has no effect in the tournament modes.
Fatal Blow
Enter LRSRDRD as a password. Enemies have one-hit kill ability. Note: This code has no effect in the tournament modes.
Abyss
Enter SDSDRLD as a password. You will lose all health after falling. Note: This code has no effect in the tournament modes.
Squeaking
Enter MLDSRDM as a password. Alternate sounds will play when objects are hit. Note: This code has no effect in the tournament modes.
Toddling
Enter SSSMRDD as a password. Alternate sounds will play when you walk. Note: This code has no effect in the tournament modes.
Challenge Mode Endurance
Enter MRMDRMD as a password. Stamina restore will no longer be available.
New Nexus outfit for Donatello
Enter DSLRDRM as a password.
New Nexus outfit for Leonardo
Enter LMRMDRD as a password.
New Nexus outfit for Michelangelo
Enter MLMRDRM as a password.
New Nexus outfit for Raphael
Enter RMSRMDR as a password.
Playmates unlocked in bonus materials
Enter SRMLDDR as a password.
Passwords
When you open the Game, go to options and then go to Passwords. Change the letters in the boxes to enter the cheat. Enter the cheats below:
Code - Effect
SLSDRDL - The game gets really hard
DSRDMRM - Turtles don't suffer any damage from things
MRLMRMR - Everything that increases your health Turns into pizzas
DRMSRLR - Your health recovers gradually
Play as Casey Jones
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.
Play as Karai
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.
Play as Slashuur
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.
Play as Splinter
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.
Unlock original TMNT arcade game
When on the rooftops in stage 9-1, start smashing the many crates to find an artifact. Take that artifact back home, and give it to April. Once she appraises it, she'll tell you that it is the original TMNT aracde game. Now go to the title screen, and go under options. The original TMNT arcade game will be there.