Looney Tunes: Back in Action Cheats - GameCube

Level select
Enter "PASSPORT" as a code.

Invincibility
Enter "TOUGHAGE" as a code to make Bugs and Daffy invincible. They will still get hit by enemies, but will not lose their lives.

Free costume doors
Enter "SUITSYOU" as a code.

Show Gossamer Doors in the Warner Bros. Studios.
Enter "GOBBLE" as a code.

Cannon Ball costume
Enter "CANNON" as a code to play the entire game in the Cannon Ball costume.

Duck Danger costume
Enter "DANGERD" as a code to play the entire game as Daffy Duck in his Duck Danger costume.

Hen grenades
Enter "HENSAWAY" as a code to give your toon a new attack option called "Hen Grenades".

Slappy Fish
Enter "SLAPPY" as a code.

ACME Shrink Ray
Enter "WEENY" as a code.

Additional $500
Enter "AMUNKEY" as a code.

Duck Danger Battle
Enter "OUTTAKE" as a code.

Wile. E. Coyote mini-game
Enter "FURRYOUS" as a code.

Bonus levels
Get the five hidden Road Runner bird seeds in a level to unlock a bonus level.

Fast And Furry-ous 220km/h: Collect all the Road Runner bird seeds in the Warner Studios level.
Fast And Furry-ous 240km/h: Collect all the Road Runner bird seeds in the Paris And Louvre level.
Fast And Furry-ous 260km/h: Collect all the Road Runner bird seeds in the Yosemite Sam level.
Fast And Furry-ous 280km/h: Collect all the Road Runner bird seeds in the Area 52 level.
Fast And Furry-ous 300km/h: Collect all the Road Runner bird seeds in the Jungle level.