Go to the options and then go to the password screen. Next you will
see 5 symbols
M - Michelangelo
D - Donatello
L - Leonardo
R - Raphael
S - Master Splinter


New Leonardo Outfit
LDMSR or RMMLL


New Raphael Outfit
DMDML


New Donatello Outfit
DDSMS


New Michaelangelo Outfit
RRLMD or DLDSM


Defense Doubles for Leonardo
MRLLM


Defense Doubles for Raphael
LRMDS


Defense Doubles for Donatello
SSSMR


Defense Doubles for Michaelangelo

MRRML


Power Ups Effect Doubles Michaelangelo

MMSLR


Power Ups Effect Doubles Leonardo

LSLSR


Power Ups Effect Doubles Raphael
SLDSM or MSLLR


Power Ups Effect Doubles Donatello

DMDRS


Attack Power Up for Raphael
RDSRL


Attack Power Up for Donatello
DRLDS


Attack Power Up for Leonardo
LMLSD


Max Out Shurikens for Leonardo
SMRDM


Max Shurikens and All Pizza for Michaelangelo
DRDSS


Sprinter Unlocked for Story Mode
MSRLS


Playmates Unlocked in Database
LSDRM


New Sound Effects
SMMRS


Defense Power up for Michaelangelo
MSRMM


Get Challenge
Mode Unlocked
Beat story mode using all 4 turtles