This is a very good game at first. It seems as good as the sonic games for the Sega. However, it seems much too short, and by the time you are at zone 3, the game can get hard... The bosses can be very difficult. By the Sky level, it almost seems that you have to have the level memorized and perfected in order to get through, or else you will fall... There are also very slight annoyances that I feel I should mention. You can often find yourself being flung right into enemies if you go to fast, so you either have to go slow, or not care about your rings. The big rings are very hard to get, too. You almost have to be tails to fly anywhere, and it still takes almost 10 minutes (the time limit). Ending on a lighter note, it has a nice nostalgic feeling and is still fun even though it's hard and short. If you think you're up to the challenge, get this game!
I enjoyed Advance 3, and Advance 1 beat them all. There was something about 2 that didn't give me the same rush with the other 2. It certainly went fast enough, but the Chaos Emerald collection mission is unneccaceribly hard. The only way you get the Chao Garden is getting all the Chaos Emeralds with one character, and the only way you can unlock Amy Rose is collecting the emeralds with EVERY character. Its not all that great as I've said. Go rent 1, 3, or if you can, Rush. All of which are better.