Go to the password screen and input the word "special". You'll hear the sound of Prince being hit and nothing else will happen. Exit this screen and start a new game. Pause the game and then press buttons in this order: B, Y, Up, Down, Left, Right, L, R, then press Start + Select to enter the cheat menu. In the cheat menu you have level select, sound select and boost meter, which increases by one, as many times as you wish, the maximum ammount of life you have. Also, during any battle, if you press X, the enemy you are facing will die. Note: this code does not work for the PAL version of the game.