OK, since somebody posted about them, and since this is kind of my thing, let me give you the rundown on the Sonic Advance games:
Advance 1 is great. Probably the closest thing we'll ever get to an actual Sonic 4. "But Bobinator, didn't th--" NO THEY DIDN'T SHUT UP.
Anyway. It's pretty short, probably even more than Sonic 2. That probably has to do with the fact that you can start a new game from any level you unlock, but still. It's still a really good game, though. Four different characters, including Amy, who's got her own slower, unique playstyle. The physics are pretty much perfect, the level design's pretty good, and there's some good music. Play it. Just be warned that the special stages are pretty awful, if you're going for the best ending.
And then there's Sonic Advance 2. This one... eh, it's really not that good. Apparently, some reviewers said that Advance 1 was too slow. So Sega went like some kind of literal genie and made the game about going fast. All the time. And you might think that'd be a good thing, but 90% of the game is just holding down right and waiting. I mean, I could be exagerrating, but so much of the levels are nothing but straight lines forward with a few pits that there's pretty much no control. The game pretty much plays itself. Skip it.
Advance 3 is a little somewhere between 1 and 2, so it's at least a lot better than 2. There's a lot more speed, but there's more level-specific gimmicks and such that mean there's still a decent enough amount of platforming. There's also a cool gimmick where you get a partner character that gives you different moves, which is a pretty nice idea. The only real issue I have with this game is that it's REALLY easy to die, either from pits, or parts where you suddenly run into a wall... just as a moving platform is coming down onto your head.
Never touch Sonic The Hedgehog Genesis. Never. Ever. Ever. Ever. EVER. Touch Sonic The Hedgehog Genesis. If you haven't run screaming from the room in horror from the video that was posted earlier, I can't help you.
Sonic Battle is kind of odd, but it's not terrible. It's a Power Stone-y sort of arena fighter, although you don't get any of the interesting levels or random items of PS or Super Smash Brothers. The fighting generally works pretty well, although it's not super deep. There's also a cool story mode where you can upgrade a robot named Emerel, who starts out as the dumpiest, slowest piece of crap ever to an unstoppable death machine by the end of the mode. Also, Shadow is super broken.
To post something original, check out Ninja Five-O, or Ninja Cop, in Europe.http://www.youtube.com/watch?v=kKU4upMDxjY#
It's a game very much in the style and spirit of the Genesis Shinobi games, and it's a DAMN sight better than the Shinobi game that came out on the GBA. For being one of the earlier GBA games, it's honeslty probably one of the best. Also, you get a grappling hook that lets you swing around, and I LOVE games that let you do that. Sadly, it's a pretty rare game, these days...