Use these codes to unlock the corresponding effect:
"Hen Grenades" attack option: HENSAWAY
Get Slappy Fish: SLAPPY
Shrink Gun: WEENY
Gossamer Doors for Warner Bros Studios: GOBBLE
Wille E Coyote Game: FURRYOUS
Unlock all areas: PASSPORT
Get all Costume Doors free: SUITSYOU
Get $500: AMUNKEY
Invincible: TOUGHAGE
Get Cannon Ball Costume: CANNON