I will be flying overseas and will need some new GBA games to kill the time (23 hrs including all lay-overs). Right now I will be bringing Zelda 4 swords, SF alpha 3 and Yu-Gi-oh for link play against my friend but I need to pick up atleast one more game before I leave. I am thinking about metroid or a castlevania game but figured I would ask and see what people recommend.

Metroid Fusion has gotten ridiculously good reviews and can be had for $14.86 at Sam's Club.

Can't go wrong with either Metroid or Castlevania.

Metroid definitely rocks...

Although if you do choose to go Castlevania, Circle of the Moon is much more difficult, and has much more replay value than Harmony of Dissonance (IMHO, of course)

Advance Wars or Golden Sun are both good.

I second the recommendation on Advance Wars. It's a fun single player and multiplayer game.

Try Harvest Moon 3.

This will keep you occupied for hours, good suggestion.

Advance wars is another good title for long trips.

If you want an action game go with metroid or castlevania, not sur how long they are but they're definitely good games.

I third it. if you want a time killer this is the one to go for. you can log dozens upon dozens of hours with this one. I've been playing it for about a year and a half and still haven't finished everything. plus since it is turn based it fits the handheld format well. In fact I'm playing it right now. I have two more maps to beat in the war room.

first off, what kind of games do you like?

Metroid and Castlevania.

How far are you in Zelda? If you're pretty far and want some good long games, I would suggest:

Golden Sun
Tactics Ogre: The Knight of Lodis

You have to be into RPGs for the first one (the sequel is coming out here soon) and you have to be into a Final Fantasy Tactics type game for Tactis Ogre (turn-based strategy with RPG elements).

Either Castlevania (played Circle of the Moon 8hrs up and 8hrs back on a train trip )
Zelda is way fun and will take a while!
Tactics: Ogre is also a decent game (though difficult to find I think)

Also - don't forget to bring a bunch of spare batteries!

Golden Sun. Kept me up on a flight to Asia.

Not too hard to find. Both EBGames.com and Gamestop.com have it available within 24 hours. Maybe you are thinking of the PSX game...that one can be hard to find.

Well here's a fourth vote for Advance Wars. I took it on an overseas flight and it kept me plenty busy on the plane and during the layovers.

Tactics Ogre is a long game. It says over 40 hours on the back, although I'm hoping to beat it before then...

It was only $20 at Meijer...

If he has headphones, then I think 2 sets of rechargables ought to last. Bring the recharger with you though for the trip back, and be sure and save games for the way back as well.

As for Circle of the Moon (the first C game for GBA no?) I hated it, it gets really repetitive quick.

I'd go with Zelda

I would take the Phantasy Star Collection.

I havent even started Zelda and am thinking of getting Circle of the moon or Metroid before I leave, but know I am also thinking of picking up advance wars. I am looking for a more action based game since zelda will give me a good RPG but I do like stratagy so Advance wars seems like a good title to try also.

Don't forget many Sam's Clubs have Metroid Fusion for $14.87... if its not marked that have them scan it.