It brings something new to the game which isn't all that bad.
The gameplay is what's really different in this game, a lot different than KH 1 and 2. This times it's a card based game. Which might be new for a lot of people because it is for me, it also isn't as bad as some would thank it would be either. It may take some time to get used to it though but once you do you'll come to like it.
The graphics ain't that bad either basically just what everyone is used to, so no big deal about them because there good enough. The sound is fantastic just like the other game, it's also good the really great voice acting like it also does to. With all of your favorite characters to. It's got a lot of replay value to you'll play through it a few times.
Overall Kingdom Hearts Re: Chain of Memories is a game that all fans will like if they didn't get a chance to play it on the GBA.