The sound is the same sound that kept you humming for days ten years ago. You know what it does ten years later, it keeps you humming. Also the placement of the music is always correct and always makes sense.
The graphics for this game are also done so well. In my mind they are some of the best I have seen on the GBA. Considering the capabilities of the GBA, these graphics are great and better yet the art direction makes sense.
The gameplay, in my opinion, is perfectly executed. I have played through the game at least 6 or 7 times and it still has not lost its magic. The action is done well to keep you coming back but the puzzles the first time you play them bend your mind in so many ways. Every dungeon seems to test your thinking more and more. The controls are responsive and just right. The first multiplayer game in the series is also on the game. The multiplayer is actually highly innovative and addictive. Overall, if you don't have it, get it, and if you don't have the money to get it, "borrow" it from someone else. This is the must buy for the GBA.