Everyone on this forum should try Sonic 3 Complete.

I've been fiddling around with the game for a few days now, and it is fantastic. The guy who made it really did a great job with it. It cleans up most of the glitches with the game, makes the presentation a lot more consistent throughout and even adds a few really nice features.
My personal favorite change is how the game handles Super Sonic. The transformation controls are drastically improved (there is no longer a chance of accidentally transforming, so you can use the Insta-Shield and the special shields as you like and then transform), the game allows you to switch back to regular Sonic whenever you want to conserve rings, and it no longer switches music when you transform, instead opting to speed up the in level music. I'm mulling over doing up a short video to show off just how nice it is.

The credits music should've been that on the original game. I'll have to pop this in an emulator since Sonic 3K is my favorite game......... probably ever.

What emulator would I need to play that?

Sega Genesis.

I use Kega Fusion, because it is (indisputably) the best of them all for computers. There are versions for Linux and Mac as well. I've been playing it a lot more on my PS3 and PSP than anything else, though.

I just recently downloaded this rom to my ps3, I have to say it is a lot better then the previous Sonic 3K rom I had.
If you feel like adding my PsN account then go ahead.
PsN: HaseoHack

Thanks Tornado!