When you finish the game, highlight the file you used to finished it (the one that has the "S" symbol). Then press A. Where it says START GAME, press UP-LEFT-RIGHT-DOWN. The NEW TIME ATTACK option will now be available. NOTE: When you select it, it will not appear the dificulty setting, instead, on top of the file´s energy tank info, instead of saying the dificulty, it will say TIME ATTACK and the Time and the World info. will appear in gold.