There are two primary ways:
When played alone, Sonic & Knuckles allowed you to play as Knuckles in Sonic 2 or play the S&K levels. sonicknuckleswsonic3bin file work
If you own the official Sega classics collection on Steam, the platform uses an official uncompressed format. The game appears in your library directly as Sonic 3 & Knuckles , running a pre-merged version behind the scenes. Common Issues and Fixes There are two primary ways: When played alone,