Kingdom hearts x how to play?

Kingdom Hearts χ is a free to play PC browser game set during the Keyblade War which has yet to be localized into English, due to Playdom (a social game network owned by Disney Interactive) shutting down. It is likely Square Enix will find another publisher to localize the game, however if you simply can't wait to play it, there are numerous guides detailing how to get an account and begin playing in Japanese.

the short answer is it's a kingdom heart rpg that's japan exclusive at the moment, and there's no sign of it trasnitioning into english anytime soon. you know about the keyblade wars, so you're good. it just takes place during that time, and does not contribute to the story whatsoever. the idea is that it allows you to play as a keyblade warrior in an rpg. as you know, keyblades are exclusive to a very select few in the kingdom hearts series. therefore, it needed to be set during the keyblade wars, where over 99% of the warriors are nameless, faceless, completely ambiguous characters that an RPG create-a-character game could take complete advantage of.