While playing the one player game, enter right,left,right,down,right,up while holding in the right thumbstick. You will hear a clarifacation sound. Go out into the main menu and level select will be on the bottom.
You will have the same character you used when you entered the code, and you will be able to use all secondary force abilities at full power. Core force abilitie levels depends on what level you choose.
Note: If you wanted to play the last level on the dark side from the selection menu, sorry, but it will always be the light side version. Also, if you turn the game off, you will have to enter the code again to get the level select option to come back.
Added by: gamefan06 Aug 22nd 2005, ID#4429