Among the absolutely best games in the GBA library.

User Rating: 9.6 | Advance Wars 2: Black Hole Rising GBA
Advance Wars 2: Black Hole Rising does not have big time marketing backing it, but it has consistently been one of the top sellers among GBA games for one reason: it is addictive and fun. Featuring a turn-based battle system that is much more involving and fun than turn-based games usually are, the game is rich with personality and style. This is easily my favorite GBA game to date. This game is great if you're looking for something for a short stint with the GBA, a sit-down-and-play-for-15-minutes type of game, but also boasts something to offer the serious gamer, since with a lot of time you can plow through several battles - or more likely, retry one a few times to get an "S" rank, the highest attainable with victory. Various types of campaigns and battles will keep your interest piqued for a long while, and there is a huge amount of replayability to this game.