The Definitive Way to Play Sonic 3 (And More)
Take the long, strange journey to discover what's happened to Sonic 3 and how to get it back.
Install instructions follow below my self-promotional stuff:
BETTER LATE THAN NEVER: www.bltn.net/
To install Sonic 3 AIR, really, all you have to do is extract the files to a folder and run Sonic3AIR.exe. That's all.
If you're looking to use Sega PC Reloaded with Sonic & Knuckles Collection, pcgamingwiki has all you need to know about using that:
Sonic 1 via Sega Forever
Here's the USB adapter I use. You might need a different one. Researching what you need is on you.