Level passwords: 

What the Heck    Kettle, Faucet, Cow, Faucet, Cow, Faucet 
Down the Tubes   Paint, Faucet, TV, Faucet, Cone, TV 
Pod races        Cone, Kettle, Cone, Cow, Cow, Kettle 
Snot a Problem   Cow, Kettle, TV, Cow, Kettle, Paint
Level 5          TV, TV, Cow, Can, Cow, Hammer 
Darkness         Kettle, Paint, Can, Faucet, Paint, Faucet 
Peter Puppy      Cow, TV, Kettle, Cow, Kettle, Paint 
Buttville        Can, TV, TV, Kettle, Cone, Cow 
Andy Asteroids   Cone, Faucet, Cow, Cow, Cow, TV