Golden Sun is a must-have game for anyone with a GBA and especially if you love role-playing adventure games.
The game has great gameplay and a wonderful and really deep storyline. It is a long game with at least 40 hours of gameplay unless you use a guide. The game revolves around the quest of four young "adepts" trying to stop their enemies from lighting the "lighthouses." It sounds complicated but it's not really once it explains everything to you. Basically an adept is a human with special powers. There are different types of adepts as each belong to a different element (fire, water, earth, wind) and each adept has powers that have something to do with that element.
The lighthouses are large constructions that are also elemental and are able to be set allight. If all four are lit alchemy will be unleashed on the world and anyone will be able to use magic, not just adepts.
Our hero's dont want this as it is our belief that this will cause wars, etc. and so pursue the group planning to light them and thwart their attempts.
Anyway this is an awesome game and should be on anybodys wish list.