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Yeah I already have like 4 hours clocked leaving Traverse Town on my Proud Mode save... Mainly because I'm oogling at all of the sights and incorporating all of the new Final Mix abilities into my strategy. The game really is fresh enough to feel like a new experience, and I'm falling in love with it all over again.
Also supposedly (was looking online, haven't tried it yet) but on Ign's unlockables section for this game you can unlock a concept video in KH. You have to seal all keyholes, complete Hade's cup and collect all puppies. It didn't say it was exclusive to a certain difficulty, plus they had another section below for how to unlock the secret ending from the original KH1.
So I have done all the requirements (playing on beginner) and I guess I'm gonna see if this is true.
Wasn't what you described the way to unlock the secret ending from KH1?