Type 'dasbak' (without the quotes) at the 'Multiplayer Mode Level Selection' screen to activate Cheat mode then type the following passwords (without the quotes) to unlock the corresponding effect in the game.

Unlock Twisted Metal Cyburbia Bonus Level:
Type 'tmburbs'

Unlock Jet Moto Suicide Swamp Bonus Level:
Type 'jmswamp'

Unlock Twisted Metal Rooftops Bonus Level:
Type 'tmroof'

Unlock Other Player View:
Type 'sleuth'

At the 'Character Selection' screen type in the following passwords (without the quotes) to be able to play as the corresponding character in the game.

Unlock Minion:
Type ''GLORIOUSBIGBOY'

Unlock Sweet Tooth:
Type 'GLORIOUSICECREAM'

Type 'glorious' during the game and then enter the following passwords (without the quotes) or codes (directional pad) to activate the corresponding effect in the game. The passwords are not case sensitive.

Unlock God Mode
Type 'divine'

Unlock 10 Homing Napalms:
Type '2hot'

Unlock Unlimited Ammo:
Type 'allyoucaneat'

Unlock Unlimited Special Weapons:
Type 'holysmokes'

Weapons are More Powerful
Type 'doubledown'

Ramming Does More Damage:
Type 'slamfest'

More Weapons:
Type 'gimmemore'

Super Powerful Machine Guns:
Type 'cusucka'

View the Framerate:
Type 'framerate'

Weapons for Health:
Press Down, Up, Right, Left, Up, Up, Down, Down.

Fire Freeze:
Press Left, Right, Up.

Drop Mine:
Press Right, Left, Down.

Fire Napalm:
Press Right, Left, Up.

Activate Shield:
Press Up, Up, Right.

Jump.
Press Up, Up, Left.

Attack from the Back
Press Left, Right, Down (Fire).

Temporary Cloak:
Press Right, Down, Left, Up.

Space-Minion’s Special:
Press Up, Down, Up, Up.