Twisted Metal Black Cheats

At the load screen for each level while playing as Minion, there are a bunch of numbers instead of words like with the other characters. These numbers can be translated into words. The formula used is 1=A, 2=B, 3=C, etc. Here are is what you get when you translate the numbers:

During game play hold L1 + R1 + L2 + R2 and press the following sequence quickly:
Right
Left
Down
Up
You will hear a message if the code has been entered correctly.
Weapons for health -
During game play hold L1 + R1 + L2 + R2 and press the following sequence quickly:
Triangle
X
Square
Circle
You will hear a message if the code has been entered correctly.
Freeze Special Attack -
During game play hold L1 + R1 + L2 + R2 and press the following sequence quickly:
Right
Left
Up
You will hear a message if the code has been entered correctly.

Here is a helpful list of the weapons and how powerful they really are:

Machine Gun - Damage: 1-5
Fire Missile - Damage: 8
Homing Missile - Damage: 5
Power Missile - Damage: 20
Gas Can - Damage: 11
Ricochet Bomb - Damage: 9
Environmental Hazard - Damage: Special
Skill Reticle - Damage: 7-70
Skill Satellite - Damage: 7-70
Skill Zoomie - Damage: 2-20
Freeze Missile - Damage: 1
Mine - Damage: 10
Charge-up Mine - Damage: 20

Freeze: Press Up, Down, Up.
Jump: Press L1 + R1.
Land mine: Press Right, Left, Down.
Charge Mine: Press Right, Left, then hold Down.
Invisibility: Press Left(2), Down(2).
Shield: Press Right(2), Down(2).
Rear-fire: Press Left, Right, Down.
Hint: Ship level: Electrocute men:
On the Ship level, you can run over a box marked "Danger High Voltage" and watch the three men who are sitting in chairs get electrocuted. They are near the front of the ship on a platform. The box is right in front of them.
Information in this section was contributed by Mazzone.

Begin the Suburbs level and go to the entrance to the carnival. Turn left and jump off a hill to land on top of a building with a structure on top of it. Blow up the structure to reveal a hole in the building. Fall through the hole and destroy the panel. A message will say Warthog has been unlocked.