As said.This game is Kingdom Hearts but fits your pockets.It has a fun wifi,great story,more than one character. (19 if i am correct)
And it expands the story making you guess what's KH BBS will be about. It has the probable best graphics on the DS,great VAs,the controls are easy and responsive.So basically a great game.
The wifi allows you to battle with friends and even agaisnt them by putting the right options and also allows you to replay the missions with them.Then what are you waiting for? Go and try it out!
Also Xion's Cute =D And aqua will be.