To start off, I'm huge fan of KH as well as the rest of the reviewers. I'm glad this game didn't get as much hype as KH2.
Gameplay - It is still the same run around and smack that we KH fans have grown to love, the camera is a little sketch at first, but you quickly learn how to use it well. The use of the slots was very similar to that of CoM, in the sense of the cards. Although tedious, it makes the game just difficult enough, at least on proud mode. It makes you think a little more before facing a large, painstakingly long fight. And adding Lv+ to slots was pretty cool, everyone loves powered up abilities. Although, I really dislike having the level slots, it really takes up room later in the game. Indeed, it is a do this here and that there game, but it has the KH feel and fills some holes in what we thought we knew about KH, so we can overlook that.
Graphics - This is the only major problem with this game that I have. I see that most of you are saying they're good graphics for a DS, but they're not DS graphics, I'm almost positive that they used the PS2 engine for this game and it's very pixel-like throughout the game. The cut scenes of course are pretty nice, but after the Final Fantasy 4 beginning, I expected more. It's not a problem, just an annoyance.
Mission Mode - This might be the more exciting part of the game for some. Using the XIII [now XIV] members, along with some unlockables [i.e. Riku, Donald, etc.] Although this is a nifty feature, certain characters need certain weapons to actually be -good-. To actually do anything in this mode you need to pick up badges in-game. Doing Missions lets you acquire crowns [or sigils] that can redeem items for Roxas from the Moogle.
Overall, it is really a great game. Not a lot of games are hard hitting for the DS other than Pokemon, so, it's a little nice to see a good handheld game. I haven't finished the game, but it seems like you can still acquire a whole lot even after you beat the storyline.
This game is the best game ever because of the abilities you get like final and the magic which is awsome the way you can have alot of spells the graphics are so good the story is good that is if your a kingdom hearts fan and played all the games. But either than that it is the best!!!!!!!