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Unfortunately the other games are just too dated for me to enjoy. I'm hoping that KH3 will be a good introduction, and show me why everyone loves the series.
Well yes and no... it's a very story driven game, and this isn't a n introduction. But you can find the previous stories online if you look. I once saw a good youtube video that was an hour long that explained the story so far, could be worth a watch before you start playing.
I'm sure they will give some sort of introduction to let you know what is going on, but I would definitely recommend playing the previous 2 Playstation games at least. They have both been released as HD versions on the PS3 and these hold up really well and are great fun.