Sonic & Knuckles + Sonic the Hedgehog 3 (World) ROM < Genesis ROMs

The concluding sequel to Sonic the Hedgehog 3, and the only Sega Genesis game to feature lock-on technology (allowing players to play as Knuckles in Sonic the Hedgehog 2 and the ability to combine it with Sonic the Hedgehog 3 into one big adventure).

Hacks - Knuckles in Sonic 1

Lock-on technology, Sonic Wiki Zone

Sonic & Knuckles (World) ROM < Genesis ROMs

Sonic the Hedgehog CD

ROMs Mega Drive - Sega - Mega Drive - Planet Emulation

Sonic & Knuckles + Sonic the Hedgehog 3 (World) ROM < Genesis ROMs

Rumour: Sega Will Re-Release Sonic 3 & Knuckles In A New Sonic Collection

Top 10 Sonic the Hedgehog Rom Hacks

Sonic & Knuckles Collection (USA) : Sega : Free Download, Borrow, and Streaming : Internet Archive