Twisted Metal 4

Advanced Attacks
These codes can be entered while playing to produce a special attack.
Submitted by herak@twistedmetal.net

All Weapon Pick-ups are Napalms
At the password screen, press Right, Left, R1, Right, Circle. CPU Only Shoots at Player 1
At the password screen, press Right, Triangle, Right, Triangle, L1.
Infinite Special Weapons
At the password screen, press Triangle, L1, Down, Triangle, Up.
Submitted by Tristan

Save Option Settings
At the password screen, enter START, START, START, START, START. Then go to the options screen and configure the game to your desire, when you exit the options main menu, you'll be prompted to save. The settings will be automatically loaded when the game is started
Submitted by tomdude01@netzero.net

Unlock All Secret Characters/Levels
For every level you beat in Tournament, you will unlock a secret Deathmatch-only level. Beat the complete game once and you'll unlock all the secret characters: Sweet Tooth, Moon Buggy, Super Thumper, Super Axel, Super Auger, Super Slam, RC Car, Minion, and Crusher.