Hidden Cities:
At the Pick City Screen, rapidly press one of the following buttons....

George: Jump
Lizzy: Punch
Ralph: Kick

Level Select:
At the Character Select screen press and hold L and all four C-buttons until you hear a tone. Start your game. You should now be able to select where you want to go at the city preview screen. Press up/down to select country and left/right to select the city. You can even select the secret areas!

V.E.R.N:
To play as V.E.R.N. (Violent Enraged Radioactive Nemesis), search for a Scum Lab facility. Eat the toxic waste barrels and you will be turned into V.E.R.N. for the rest of the stage. V.E.R.N can fly and has super strength.

Bad Food, Good Food:
When a World Tour is over and the name of an American city appears on screen, hold Down and, if you're George, press Jump three times; if you're Lizzy, Punch three times, or if you're Ralph, Kick three times. This code will change bad food to health-boosting good food.

Allergies:
Each monster is allergic to something...

George: Dogs
Lizzy: Birds
Ralph: Cats

GameShark Codes

Infinite Health	P1  800BF86COO64
		P2  800BFA360064
		P3  800BFCO40064 

Thanks to Revolution readers JJ, Matt Robben, Chip & vern, Dennis Pearson, Ryan Zusman, Prong_666, Sam Rickles, Sufyan, Jacob Buffi, Justin Green, Trevor McCrory, Austin Wilder, Anand misir, and Jesse Morales!