With the release of Kingdom Hearts 3, I tried to prep for it by making sure I played all of the past KH games. I didn't even get a few hours into Kingdom Hearts before utterly losing interest.

All you really need to know is that in Kingdom Hearts, every major character has 11 different identities. Some of them are parts of the character that are separated from the whole, and some of them are parts that are combined with another character's parts.

The writing is also just terrible and not worth your time.