Sonic 2 has some of the best music too! I love Mystic Cave Zone. Buuuut...it has a casino zone. I HATE casino zones. Even more than I hate underwater zones, haha. They're just these levels that prove to be extremely irritating for various reasons - drowning, excessively neon flashing lights, pinball/slot machines, etc. That said, Casino Park in Sonic Heroes was a lot of fun!
You wouldn't get much for it either =P
Mine is...somewhere. With the GBA Player attached to the bottom still probably. The controller is still in my room. xD