Twisted Metal 3

Unlimited Health:
To do this move you have to use Sweetooth or Minnion(There are codes to get them.) put these both as your password. 
L1, square,x,R1 and start then go back and use this one for your assword.Triangle,circle,up,left, down.

The way to do Extra Damage:
In the password screen, type in triangle, circle,down, left, up.

Club Kid Level:
In the password screen, type in left, left, left, square, square. This should bring you to disco room with a disco ball in the middle.
Note: the disco ball is for the lightning.

Huge Ricochet bombs:
In the password screen, type in left, right, left, right, up.

Computer cars miss health pick-ups:
In the password screen, type in down, L1, down, start, triangle.

Freeze missiles: 
In the password screen, type in triangle, up, circle, right, start.

Unlimited  Ammo:
In the password screen, type in traingle, circle, up, right, down.

Invincibility:
In the password screen, type in L1, square, X, R1, start.

Better weapons:
In the password screen, type in R1, R1, L1, L1, L1.

EGYPT surprise: Hit the sphinx on the head and look who appears...

TOKYO surprise: Remote Bomb the fan, then go to the edge and all the opponents will come to attack you, but they will fall on to the fan and die, unless they shoot you then you fall in.

Secret Demo Level:

In the password screen, type in up, up, up, left, left. Then start death match mode and choose your level.

Secret Warehouse level:

In the password screen, type in square, square, square, left, left. Then start death match mode and choose any level.

Note: You won't do that level, you will automatically go to the secret level.