TWISTED METAL 3
Spice up weapons, deathmatches with these
                   babies:

                   Enter the following passwords at the password
                   screen for:
                   Invincibility: L1, Square, X, R1, Start
                   Unlimited ammo: Triangle, Circle, Up, Right, Down
                   99 freeze missiles at start: Triangle, Up, Circle,
                   Right, Start
                   CPU cars ignore health power-ups: Down, L1,
                   Down, Start, Triangle
                   Smarter homing missiles: Triangle, Left, Down,
                   Right, Up
                   Massive force (makes impacts/explosions much
                   more powerful): Triangle, Circle, Down, Left, Up
                   No pick-ups in level: Select, Select, R2, L2, Start
                   No heath pick-ups in level: Select, L1, Select,
                   Start, Circle
                   Ice levels: Up, Up, X, X, Up
                   Extra fast weapons: R1, R1, L1, L1, L1
                   Solo deathmatch (unlocks option to fight with 0
                   CPU opponents): X, Circle, Circle, Circle, Circle
                   All pick-ups are homing missiles: Start, R1, L1,
                   Start, Start
                   All pick-ups are napalm: Start, Start, L1, L1, L1
                   All pick-ups are power missiles: Start, L1, Start,
                   L1, Start
                   CPU enemies gang up on humans: L1, R1, L1, R1,
                   R1
                   Unlimited specials: L1, L1, R1, R1, R1
                   Submitted by Patrick Mansfield

Rumble in bonus levels and the demo level:

                   Enter the following passwords, then return to the
                   main menu and select deathmatch. Choose any
                   level or car and begin at the bonus level you
                   entered.
                   Left, Left, Left, Square, Square: Club Kid's House
                   Square, Square, Square, Left, Left: Warehouse
                   Up, Up, Up, Left, Left: Demo Level

No need to keep fiddling with options:

                   Enter this password: Start, Start, Start, Start, Start.
                   Return to the main menu and set up your options
                   and other game settings to what you use most
                   often. Then begin a game. Before the game begins,
                   you'll be asked to save your settings.

Play as Sweet Tooth and Minion:

                   Play as Sweet Tooth
                   Enter Circle, Circle, L1, L1, Start as a password.

                   Play as Minion
                   Enter Up, Start, Down, L1, Square as a password.

Here are some of the special moves:

                   Invisibility Up, Down, Left, Right
                   Freeze Left, Right, Up
                   Jump Up, Up, Left
                   Rear Fire Left, Right, Down