Weapons Cheats
There are three cheats that unlock special weapons for Bugs and Daffy. These weapons are the ACME Shrink Ray, which shrinks enemies; the Hen Grenades, which are explosive chickens that you can throw; and Slappy Fish, a fish that you can use to slap enemies. Enter "WEENY" in the password menu to unlock the ACME Shrink Ray. Enter "HENSAWAY" to unlock the Hen Grenades. Enter "SLAPPY" to unlock Slappy Fish.
Costume Cheats
The costume-related cheats for "Looney Toons: Back in Action" allow you to dress up in different costumes as you play the game. There is also a cheat that lets you use all the costume rental stands for free. Enter "CANNON" to be dressed as a cannonball. Enter "DANGERD" to play the game dressed as Danger Duck. Enter "SUITSYOU" for free costume rentals.
Character Effect Cheats
There are two cheats that directly affect your character once you start the game. The first of these cheats grants you invincibility; when you have it activated, you can still get hit by attacks and they may stun you, but you will not take damage. The other cheat gives you extra money to start out with. Enter "TOUGHAGE" to be invincible. Enter "AMUNKEY" to start with an extra $500.
Other Cheats
These cheats have a variety of effects on the game. With these cheats, you can reveal all the gossamer doors in Warner Bros. Studios, unlock every location in the game, unlock the Wile E. Coyote mini-game and unlock the Danger Duck battle. Enter "GOBBLE" to reveal all the doors in Warner Bros. Studios. Enter "PASSPORT" to unlock every level in the game without beating the previous levels. Enter "FURRYOUS" to unlock the Wile E. Coyote mini-game. Enter "OUTTAKE" to unlock the Danger Duck battle.