Cel Damage

Cheat mode:
Enter the character selection screen, select "Load" then enter ENCHILADA! as a name to unlock all cars, tracks, and modes. Enter PITA or as a name to unlock various combinations of features.
Zdhulse12 and AZAcidRock.

Invincibility:
Enter the character selection screen, select "Load" then enter CODY as a name.
MccStone1.

Pen and ink graphics:
Enter the character selection screen, select "Load" then enter PENCILITIN as a name.

Plastic graphics:
Enter the character selection screen, select "Load" then enter FANPLASTIC as a name. Enter the event selection screen and highlight "Smack Attack". Press Down and select the "Event Settings" button. Then, select the "Options" button and select the "Rendering Modes" button. Change this option to ""Render: Plastic". The message "Current mode: plastic" will appear. Return to the even selection screen, then proceed to select a level and begin game play. To return to normal, repeat the steps and choose the cartoon renderer at the "Rendering Modes" screen.

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

Melee weapons:
Enter the character selection screen, select "Load" then enter MELEEDEATH as a name.

Hazard weapons:
Enter the character selection screen, select "Load" then enter HAZARDOUS as a name.

Personal weapons:
Enter the character selection screen, select "Load" then enter UNIQUEWPNS as a name.

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

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

Brian The Brain and Space world:
Enter the character selection screen, select "Load" then enter BRAINSALAD as a name.

Alternately, win Smack Attack, Gate Relay, and Flag Relay in all three levels of the Space world.
Dark Age.

Count Earl and Transylvania world:
Enter the character selection screen, select "Load" then enter COUNTDEAD as a name.

Alternately, win Smack Attack, Gate Relay, and Flag Relay in all three levels of the Transylvania world.
Dark Age and Gamelord2000x.

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

Alternately, win Smack Attack, Gate Relay, and Flag Relay in all three levels of the Jungle world.
Dark Age.

Whack Angus and Desert world:
Enter the character selection screen, select "Load" then enter WHACKFAD as a name.

Alternately, 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.

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

Gate Rally mode:
Win once in Smack Attack mode.
thone43.

Flag Rally mode:
Win four times in Smack Attack or Gate Rally 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.

Hint: Easy kills:
As Flemming, get his personal weapon on the first desert world level. Go to the end of the train tracks, then turn around. When someone approaches, shoot nonstop.
SPUDDYDUDDY0089.

On the first desert world level. Go all the way to the end of the train tracks. Go through the hole. It is easier to kill the people with four flags if you are on the other side of the arena.
maximilien.

Hint: Extinguish fires:
When Flemming, or any one else with the Lasers hits you a number of times and causes you to go into flames, try going into the water. That will put the fire out if you do so quickly. The levels with water are the first two Jungle levels (the three pounds with the crocodiles, and the other level with the shallow water in the piranha pits), and the first Transylvania level (the creek, before you hit the spider web spring).

Another way to extinguish a fire is to go through the alien cases in Babbling 5.
DUKE WILSON.

Hint: Babbling 5: Free Rocket Pack:
To get the secret Rocket Pack for any character, find the rotating platform with the jump on it (which occasionally raises into the air) and go off the jump. You will obtain a Rocket Pack for a short time, but will still be able to use your other weapons (except Gunship, which is also a flying weapon). Use this with the Cluster Bombs weapon to rain bombs on your opponents, or with the Machine/Tommy guns to become a turbo-charged Gunship.
The Evil Dr. Argon.

Hint: Spin on the ground:
Go top speed then hold L + R. Press Left or Right on the Analog-stick. If done correctly, you will start spinning.
Max Kemmett.

Hint: Count Earl: Easy kills:
When playing on Smack Attack with Count Earl on Wild Wooly West, get his personal weapon. On the railroad bridge go straight. When you see someone coming on either side close to you fire. Count Earl's seeker missiles should kill your opponent easily.
Alex Thrasher.

Hint: Flemming: Easy kills:
As Flemming, get his personal weapon on the first desert world level. Go to the end of the train tracks, then turn around. When someone approaches, shoot nonstop.
SPUDDYDUDDY0089.

Hint: Whack Angus: Easy kills:
On the first desert world level, get his personal weapon. Go near the end of the train tracks, then turn around. When someone approaches, press A.
SPUDDYDUDDY0089.

Hint: Weapons:
Win the indicated level unlock the corresponding weapon.

Axe: Wild Wooly West
Baseball Bat: Babbling 5
Boxing Gloves: Swamp Stomp
Broadside Cannons: Temple of Boom
Buzz Saw: Death Valley
Chain Gun: Wild Wooly West
Chainsaw: Monster Mosh
Cluster Bombs: Mesa Madness
Freeze Ray: Monster Mosh
Grenade: Babbling 5
Gunship: Bohemian Raspberry
Harpoon: Swamp Stomp
Portable Hole: Shmoe vs. The Volcano
Rocket Booster: Lunarcy
Spring: Count's Castle
Vacuum: Shooting Stars