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

Invincibility:
Enter CODY as a name.

Gate Rally mode:
Win once in Smack Attack mode.

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

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.

Transylvania world:
Enter the character selection screen, select "Load" then enter EARLSPLACE as a name.

Whack Angus:
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.

Desert world:
Enter the character selection screen, select "Load" then enter WHACKLAND as a name.

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

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.

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.

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.

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.

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.

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].