Select the 'Games Status' option and choose any character. Then enter the following passwords to unlock the corresponding effect.
Unlock ALL Standard Characters: GANGS_ALL_HERE
Unlock Alien Character: INVITE_VISITOR
Unlock Sand Factory and Secret Base Levels: SECRET_LOCALES
Unlock ALL Standard Characters, Alien Character and 2 Bonus Levels: GIMME_DA_WORKS
Unlock Bonus Characters and Levels: WMNNWLHTSCUCLH
Unlock Expert Mode: HARDEST_OF_ALL
Unlock Slow Motion Mode: SLOW_MOTION_ON
Unlock Big Wheels: MONSTER_WHEELS
Unlock Low Gravity: REDUCE_GRAVITY
Unlock Invincibility: I_WILL_NOT_DIE
Unlock Homing Missile Power-Up: DEADLY_MISSILE
Unlock Two of same vehicle in 2-Player Mode: SAME_CHARACTER
No Enemies: GO_SIGHTSEEING. Then start a game in Arcade mode.
View FMV Sequences: SEE_ALL_MOVIES. Then highlight a character on the game status screen and press X.
Unlock Special Weapons: During gameplay enter the following codes to activate the 'Special Attack' of the corresponding weapon. The weapon must be in the inventory but does not have to be active.
Interceptor Missiles (Turbo) - Uses 2 Missiles: Push Up(3) times then shoot the Machine Gun to speed up for a few seconds.
Bull's Eye Rockets (Stampede) - Uses 1-5 Rockets: Push Up, Down, Up then shoot the Machine Gun to rapidly fire multiple non-homing rockets.
Bull's Eye Rockets (Boost Rocket) - Uses 2 Rockets: Push Up, Down, Up, then shoot the Machine Gun. If an opponent is hit, he or she is taken for a sky ride.
Interceptor Missiles (Halo Decoy) - Uses 2 Missiles: Push Up(2), Down then shoot the Machine Gun to cause your opponent's homing missiles or special attacks to follow your missiles instead of your vehicle.
Roadkill Mines (Magnetic Mine) - Uses 2 Mines: Push Left, Right, Down, then shoot the Machine Gun to drop a mine that will attract nearby cars.
Sky Hammer Mortar (Crater Maker) - Uses 5 Shells: Push Down(2), Up, then shoot the Machine Gun to drop a Mega Bomb that will leave a crater.
Bruiser Cannon (Scatter Blast) - Uses 6 Shells: Push Down, Up(2), then shoot the Machine Gun to shoot 6 Cannon Shells simultaneously.
Roadkill Mines (Cactus Patch) - Uses 1-6 Mines: Push Left, Right, Up then shoot the Machine Gun to rapidly deploy a group of mines.
Bruiser Cannon (Cow Puncher) - Uses 2 Shells: Push Down, Up, Down then shoot the Machine Gun to punch opponents' vehicles back.
Sky Hammer Mortar (Turtle Turnover) - Uses 2 Shells: Push Down(3) then shoot the Machine Gun to flip your opponents' vehicles.
Unlock Alternate View: During gameplay press 'Select' to see the steering wheel and driver's hand.