Think Speed Racer, Mario style.
The gameplay hasn't changed from its previous installment, but it's still as intense. A is to accelerate, B is to brake, X is to change the map(it's on the bottom screen), and Y is to use the weapon( the Left shoulder button does that too, which I recommend you use, since it's easier to reach), and the Right shoulder button makes you do a slide. You have to use these moves to your advantage, which, when used properly, you will have a 4 second lead(which is good) against the other racers.
The graphics look like the game is on the N64, which is pretty good for a handheld game. There are some blocky looking trees in a few of the racing courses and a few lines on some of the racing bumpers, but it's not too bad. I'm just surprised that the graphics look like the N64(I guess the next gen of handhelds will have PS2 graphics).
The sound is very well done, and doesn't get on your nerves(they're actually Ipod-worthy). Hearing items getting used and the voices of other racers, gets annoying after awhile.
This is a good racing game for the DS, and if you're a racing fan, you should get this. If you have a DS, you should get this too. You won't regret getting this.