A must-play sequel. One of the best RPG series ever created.
The Lost Age is the second part of the story in the Golden Sun saga, since it starts right where the first game left us. The story's many mysteries are going to get revealed in this game and trust me, it's not something you'll all expect. There are many surprises and many new things to find out.
Most of the game's themes are the same as in the first game. However, in the Lost Age you get to play as the other wandering party: Felix, Jenna, Sheba and Piers, a "not-so-young" man that you'll get to know in the game, along with Kraden of course. This fact instantly makes you wonder, "why am I in control of these guys? Aren't they supposed to be the ones I wanted to stop?" After a while the answers will come to you and trust me everything flows out well in the end. Plus, I found the dialogues to be somewhat smaller, making them perfect to watch.
The gameplay has the exactly the same concepts only with two major diferrences: There are many new summons which require several different kinds of Djinn in order to call them and also there are of course new psyenergies for you to discover and use, as well as new Djinn and weapons to find.
The other major difference is that this game is quite bigger than the first one, it'll take you approximately 20-25 more hours to finish it, and it is also a lot more difficult in the puzzles, making it as it should be. I have to mention though that the game designers were a bit cruel at some stages where you could easily get lost and not know what to do, as well as putting stuff in places where you have no idea as how to reach them.
The graphics design is the same, of course the new summons are far more spectacular than the old ones, and the sound remains the same, adding new tracks and keeping the old ones.
Overall, it is one of the best games I've ever played in a Nintendo console and I highly recommend it to anyone.