I just started playing KHII yesterday, and I'm liking it a lot so far. Got a question, though: when you choose a difficulty setting at the start of the game, does your choice have any real impact on the game's content? I mean, if you were to choose "beginner" difficulty, does anything get left out? Are there secrets that can only be unlocked by playing on the hardest setting?

Please respond without spoilers of any kind - this is one of very few games that hasn't had some major plot points ruined for me in recent years, and I'd like to keep it that way. Ta