Cheat mode
Enter ENCHILADA! as a name to unlock all cars, tracks, and modes.

Invincibility
Enter CODY as a name.

Pen and ink graphics
Enter PENCILS as a name.

Jungle world
Enter the character selection screen, select "Load" then enter TWRECKSPAD as a name.

Space world
Enter the character selection screen, select "Load" then enter BRAINSALAD as a name.

Ranged weapons
Enter the character selection screen, select "Load" then enter GUNSMOKE! as a name.

Movement power-ups
Enter the character selection screen, select "Load" then enter MOVEITNOW as a name.

All FMV sequencest
Enter the character selection screen, select "Load" then enter MULTIPLEX! as a name.

Big head mode
Hold L + R + Up during game play.

Brian The Brain
Win Smack Attack, Gate Relay, and Flag Relay in all three levels of the Space world.

Count Earl
Wing Smack Attack, Gate Relay, and Flag Relay in all three levels of the Transylvania world.

T. Wrecks
Win Smack Attack, Gate Relay, and Flag Relay in all three levels of the Jungle world.

Whack Angus
Unlock all modes (Smack Attack, Flag Rally, Gate Relay), then win all three levels in the Desert world in each one (total of nine). After completing the last level, Whack Angus will be unlocked as a playable character. His personal weapons are throwing Butchering Knives.

Gate Rally mode
Win once in Smack Attack mode.

Additional FMV sequences
Successfully complete Smack Attack, Gate Relay, and Flag Relay with each character to unlock additional FMV sequences.

Hint: Flag trial
You have to have at least one or two of these weapons: the Helicopter and Guns, and the Vacuum. Hurry and find the Vacuum in one of the weapon bins. Go straight to the Winner's (or Flag) Circle and wait for whoever gets all four flags to arrive at the circle. Once they are close enough, just vacuum them up. That weapon will not only take their Flags, but also their weapon. After doing so, go to the "Victory Ring". When you have the Helicopter and Guns weapon, just after the lone Flags first, then take out any one else who has the last desired Flag(s) you need. Next quickly go to the "Ring", because you have a limited time with that weapon. Use the Helicopter And Guns to take out any one who has the Flags, and easily fly to the goal.