Simply complete the game, each time you complete the game you will be award an extra live option, which will increase every time you complete the game (maximum is 9). The same goes for Extra Credits, instead of completing the game, just let the main character die and each time you time you will be given an extra credit. However you must go to the options - game settings menu to change the number of credits available or choose how many lives you want, if you do not do this first then your game will continue its standard settings.
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