Sonic. Knuckles. That weird, satisfying click when two cartridges become one. The wSonic3.bin repack — a tiny filename that tips its hat to one of the most iconic Genesis oddities: Sonic & Knuckles’ “lock-on” fusion with Sonic 3. Here’s an intriguing, useful take exploring what that file is, why people chase it, and what to watch for if you encounter it.