If you are looking for "free" advantages, you can enter these passwords at the password screen (L = Leonardo, M = Michelangelo, R = Raphael, D = Donatello, S = Shredder): D S R D M R M Infinite Shuriken R S R L R S M Mighty Turtle (Increased Power) L S D R R D R Super Offense Power S D L S R L L Super Defense Power L D R M R L M

: Beating the unlocked arcade game is one way to unlock secret fighters like Casey Jones , Karai , Splinter , and Slashuur for the main game. Popular Cheat Codes

Smash the crates on the roof to find a containing an antique item.

Finish the stage with the item, then take it to ("2nd Time Around") for appraisal.

In Teenage Mutant Ninja Turtles 2: Battle Nexus , there is no specific item or unlockable officially named "Deep Piece." This term may be a misremembered reference to "Antique Items," which are hidden collectibles found throughout the game that unlock various bonuses. Unlocking Content in Battle Nexus