At any time you return to a U.S. city after taking a World Tour, hold Down and press Jump, Jump, Jump when playing as George; hold Down and press Punch, Punch, Punch, when playing as Lizzy; or hold Down and press Kick, Kick, Kick, when playing Ralph. All food can now be eaten, including normal items.
Gargoyle
Accumulate 100,000 points during game play.
Iron Stomach
This code is only available each time you return to a US City after taking a World Tour. This allows all food to be digestable. It also means that normal items that would make one of the monsters puke before, will now restore some health like normal food.
Code - Effect
Hold Down and press Jump button 3 times - George
Hold Down and press Punch button 3 times - Lizzy
Hold Down and press Kick button 3 times - Ralph
Triple score for health power ups
Enter the code for the respective character after the jumbo jet ride before the world tour begins
Code - Effect
Press and Hold Up, then press Jump, Jump, Jump - George
Press and Hold Up, then press Punch, Punch, Punch - Lizzy
Press and Hold Up, then press Kick, Kick, Kick - Ralph