April's adventure mode:
As Donatello, successfully complete the Ghetto level.



April's melee mode:
As Casey Jones, successfully complete adventure mode.

Casey Jones' adventure mode:
As Raphael, successfully complete the Subway level.

Casey Jones' melee mode:
As Casey Jones, successfully complete adventure mode.

Foot Soldier's adventure mode:
As Raphael, successfully complete his adventure mode.

HUN's adventure mode:
As Michaelangelo, successfully complete his adventure
mode.

HUN 2's melee mode:
As HUN, successfully complete his adventure mode.

Monster's melee mode:
As Hun, successfully complete the Sewer Canal level.

Shredder's adventure mode:
As Donatello, successfully complete his adventure mode.

Splinter's adventure mode:
As Leonardo, successfully complete his adventure mode.

Tech Foot's melee mode:
As Foot Soldier, successfully complete adventure mode.

Casey Jones' jacket costume:
As April, successfully complete her adventure mode.

Casey Jones' red shorts costume:
As Casey Jones, successfully complete level the Ghetto
level.

Shredder's gold costume:
As Shredder, successfully complete his adventure mode.

April's Apartment stage:
As Donatello, successfully complete the April's Apartment
2 level.

Autumn stage:
As Michaelangelo, successfully complete The Dojo level.

Dojo Complete stage:
As Casey Jones, successfully complete the Turtle's
Lair level.

Sewer Falls stage:
As Raphael, successfully complete the Sewer Falls level.

Sewers stage:As Leonardo, successfully complete the Sewers level.

Shredder's Palace Exterior stage:
As Leonardo, successfully complete The Lab 12 level.

Subway stage:
As Leonardo, successfully complete the Sparring With
Splinter level.

Waterfall stage:
As April, successfully complete the Turtle's Lair level.


Fight as Stonebiter:
Play through Adventure Story mode and unlock Monster.
At the character selection screen in Melee Match, highlight Monster
and keep selecting and deselecting him until speaks. You will
hear him speak with Raphael's voice. You will now be playing as
Stonebiter. Note: Monster will still look and play the same. Stonebiter
is on the front cover of the game's box, but he is nowhere to
be found in any part of the game. Most likely, Stonebiter probably
is the version of Monster found in the Warehouse area in Shredder's
Adventure Story where you fight Monster helping the turtles, because
Stonebiter was an ally of the Turtles in the three part series
episode, "Notes From The Underground".