Use a text editor to edit the 'defuser.ini' file in the '\ea games\harry potter and the prisoner of azkaban(tm)\system\' folder. Find the 'Comma=' entry near the bottom of the file. Add the word 'God' so that it now reads 'Comma=God'. Start the game and press [Comma] and your life will not decrease. You must press that key every time you enter a new challenge or activity.