2011-01-26, 03:08 AM
Final Mix started off as a solution to extra content that America got with the first Kingdom Hearts (remember the desert boss and clocktower boss?) because Japan had a massive hissy fit about it. So they rereleased Kingdom Hearts there with the bosses and a battle against the first member of Organization XIII (Axel) and some extra plot. Since then, every game to date gets a Final Mix rerelease about a year after its primary release with bonus content. And yes they're official.

