Teenage Mutant Ninja Turtles
Michelangelo will get an improved weapon in the story mode!
Go to the options and then go to the password screen.
Next you will see 5 symbols Put in MSRMM
Get Challenge Mode Unlocked:
Beat story mode using all 4 turtles
Get Stage Select Levels:
Beat a level to unlock it for Stage Select
New Costumes:
Change your PS2 System date to Dec 24th or 25th to get Santa
outfits or October 31st for Halloween outfits.