If you change the date on your system to December 25th or October 31st the Turtles will appear in an alternate costume which is themed on the date you have selected. If you selected December 25th the Turtles will have Christmas costumes and on October 31st they will have Halloween costumes.

Complete the following tasks using the indicated character to unlock more characters for Vs. Mode.

Unlock Casey Jones:
Using Raphael beat Stage 1.

Unlock Splinter:
Using Leonardo beat Dojo Stage 3.

Unlock Hun:
Using Michaelangelo beat Stage 6.

Unlock Oroku Saki:
Using any turtle defeat Oroku Saki.

Unlock Yoshi Hamato:
Using any Turtle beat Challenge mode.

Unlock Shredder:
Using any Turtle defeat Shredder.

Unlock Evil Turtlebot:
Using any Turtle beat Stage 3.

Press the following key for the corresponding character when entering passwords.

D - Donatello

L - Leonardo

M - Michaelangelo

R - Raphael

S - Shredder

Enter the following codes into the 'Password' screen at the 'Options' menu (to enable the alternate costumes you must hold L or R when selecting your character).

Unlock Alternate Costume (Raphael): SLSMM

Unlock Alternate Costume (Leonardo): RSLMD

Unlock Alternate Costume (Michaelangelo): RLSLS

Unlock Alternate Costume (Donatello): RRSLR

Power Up Effects Double (Raphael): LSMMS/RSSSR

Power Up Effects Double (Donatello): MLSDS

Power Up Effects Double (Michaelangelo): RLMSM

Power Up Effects Double (Leonardo): RSDMM

Attack Power Up (Raphael): RDSRL

Attack Power Up (Leonardo): LMLSD

Attack Power Up (Donatello): DRLDS

Defense Doubles (Leonardo): LDSMS

Defense Doubles (Donatello): MLMLS

Defense Doubles (Michaelangelo): MRRML

Defense Doubles (Raphael): SDRML

Defense Power Up (Michaelangelo): MSRMM

Unlock Unlimited Fire Shurikens/ALL Food is Pizza (Michaelangelo): MSSLD

Unlock Unlimited Shurikens (Leonardo): SSLDM

Unlock Playmates Toy Data Base: LSDRM

Unlock Splinter for Story Mode: LSLML

Change Sound Effects: DDDML

This mode becomes unlocked when you have completed Story mode using ALL four turtles (Michaelangelo, Raphael, Donatello and Leonardo).

To unlock the different courses in the Bonus Game enter the following codes on the Password screen:

Leo-Slinter-Mike-Mike-Splinter - Course 1

Splinter-Splinter-Leo-Don-Mike - Course 2

Mike-Splinter-Splinter-Leo-Don - Course 3

Splinter-Raph-Leo-Mike-Don - Course 4

Leo-Splinter-Don-Raph-Mike - Course 5