For the advance:
Megaman Battle network series. All of them. Those games comprised my childhood and have so much depth to them. I've played them for years and still can't beat most of them, and on what few I have, I can barely scratch the post-ending gameplay. If you are getting 3, make sure to get the blue version, as is it objectively superior to white version (more optional bosses). Don't waste your time on 4-6. They all suck, especially 4. Still, I could rant about the originality and addictiveness of these games for hours. These are a gem for the GBA and IMO the best series released on the platform.
Metroid Fusion. Relatively quick playthrough when compared to console standards. Definitely worth a play if you like Metroidvania games. Very smooth gameplay.
If you like platformers, the Super Mario Advance remakes are a great choice.
There's a Link to the Past remake for the GBA too, if you haven't already played it.
EDIT: On the Megaman front, 2 is the best in the series, followed by 3. Get those if you are getting anything.
Megaman Battle network series. All of them. Those games comprised my childhood and have so much depth to them. I've played them for years and still can't beat most of them, and on what few I have, I can barely scratch the post-ending gameplay. If you are getting 3, make sure to get the blue version, as is it objectively superior to white version (more optional bosses). Don't waste your time on 4-6. They all suck, especially 4. Still, I could rant about the originality and addictiveness of these games for hours. These are a gem for the GBA and IMO the best series released on the platform.
Metroid Fusion. Relatively quick playthrough when compared to console standards. Definitely worth a play if you like Metroidvania games. Very smooth gameplay.
If you like platformers, the Super Mario Advance remakes are a great choice.
There's a Link to the Past remake for the GBA too, if you haven't already played it.
EDIT: On the Megaman front, 2 is the best in the series, followed by 3. Get those if you are getting anything.