Get 50 plungers from sifting through garbage
Climb the ladder at the end of a level
Get 20 capes from sifting through garbage
Find snot 50 times from sifting through garbage
Find beans 50 times from sifting through garbage
Complete Flatulant Swamps
Complete The Pitts
Complete Boogerville
Complete Nasal Caverns and Mucous Mountains
Complete Pus Palace and finish the game
View the secret ending (press A+B+C+Start on controller 2 after defeating Booger Meister)
Defeat Hickboy without pressing down
Defeat Revolta without passing gas
Defeat Flyboy without jumping
Defeat Deoder Ant without getting hit by his Ant-Acid attack or running out of gas
Defeat Booger Meister without taking damage and using only loogies
Get an extra life
Get the chili pepper
Get milk
Get 25 Plungers
Beat the first level
Earn 500,000 points
Earn 10,000 points
Earn 50,000 points
Earn 100,000 points
Explore every sewer in Flatulant Swamps
Explore every sewer in The Pitts
Explore every sewer in Boogerville
Explore every sewer in Mucous Mountains
Explore every sewer in Nasal Caverns