Stars:
Start a new game and hold Triangle + Square + X at the "New Game/Load Game" screen.
While in game play, hold Select + Start. A large number of stars will fall from the sky. These can
be used to gain extra lives or to grow the egg friends. This code will also clear the current stage.
Hold Select and press Start to clear the stage 6. 

Head Start:
While on the main menu hold Select until the map screen is displayed, then press Start on the
new game option when Hermie is halfway across the screen. The game will start on World 0 -
Level 0 - The Main Menu Screen. You can get three friends (penguin, turtle and chicken) in egg
form. Use the game menu options to start a new game with these or load a saved game in to be
played with these characters. 

Map Run:
To have Hermie run across the map hold Square in the map screen.