Cheat Twisted Metal Black

Invincibility:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press Up, Down, Left, Right, Right, Left, Down, Up during the game. The message "Invulnerability On" will appear. Repeat the code to disable. This works in story, endurance, challenge, and multi-player modes.


Unlimited health and turbos:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press Right, Left, Down, Up during the game.


Mega machine guns:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press X, X, Triangle during the game.


One hit kills:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press X, X, Up during the game.


God mode:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press Up, X, Left, Circle during the game. You will have unlimited weapons, health, turbo, and energy.


Weapons for health:
Set the control option to "Classic". Hold L1 + R1 + L2 + R2 and quickly press Triangle, X, Square, Circle during the game.


Alternate weapon view:
Press Select + Right during the game.


Man Slaughter:
Once the ship docks on the island in the Prison Passage level and you can exit the boat, go to the right (left if facing the ship). Follow the waterline until you reach some crates. Shoot them up until a ramp is formed. Shoot the side of the ship until a opening appears. You will unlock Man Slaughter there.


Minion:
Unlock all the secret characters, then complete the game in story mode with all of the characters. A FMV sequence showing Minion reassembling and a "Beware of Minion" message will appear. He appears after Sweet Tooth on the character select screen.


Warthog:
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. 


Freeway level:
Start an endurance match in the Snowy Roads level. Get ten kills in a row without dying.


Power Plant level:
Head to the end of the Snowy Roads level with the longer building. Face the drop and head to the left side of that gap. Slowly roll over the edge, and there should be a lower level with the cube on it. 


Prison Ship level:
Get fifteen endurance kills in the Junkyard level to unlock the Prison Ship level in multi-player mode.