Press Jump, then when in the air press Jump lots to have your character to flap their arms. Your character will fly and slowly descend to the ground. This works best if you jump off a tall building.
Highlight George, Ralph, or Lizzy at the character select screen. Press Up after choosing a character to select a different color.
When the screen that indicates the next city appears, rapidly tap the indicated button for the character currently in use. Then, an alternate city will appear for game play. Pressing buttons for the remaining cities gives you only good food. For example: When playing as Lizzy in London, press Punch, Punch, Punch. Then the phrase "Secret code accepted" will appear. Now every window with items will only contain good food.
City Alternate city
Kodiak Snow City
London Big Ben
Louisville Scumlabs Biowepons
Moab Game Refuge
Phoenix Area 69
Rio de Janerio Sunset City
San Diego Caleb's City
Washington D.C. The Capital
Play As Tyrannosaurus Rex
Beat all levels, then start a new game. Then on the character selection screen, highlight Lizzy. Now hold Z and tap L, R repeatedly. If you entered the code correctly, you will hear a scream.
Wait until the current level is over and Cleveland, Fargo, Oklahoma City or Reno appears on the screen. Then before the city name disappears, press Jump, Punch, Kick if playing as George; press Punch, Kick, Jump if playing as Lizzy; or press Kick, Jump, Punch if playing as Ralph. Now your character will jump seven to ten days forward in the game.