I forgot to specify the difficulty part in the rules, however this does not affect at all any results of the scores for individual level. After the end of some levels, and after the final time, rank, etc, are shown on the screen, there will be a sword fight with a boss. The difficulty set on the menu ONLY affects the sword fights, all enemies within the level behave the same no matter what difficulty you choose. So, when you are going for a score on an individual level, the difficulty does not matter, since the sword fights come after the final time for the level has been achieved.