Head Start:
Hold Select on the main menu 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:
Hold Square in the map screen to have Hermie run across the map.

Stars:
Hold Triangle + Square + X and start a new game at the "New Game/Load Game" screen. During 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.