Knuckles the Echidna in Sonic the Hedgehog 2 (Genesis/Mega Drive Hack) : r/3dsqrcodes

Ordinary Sonic ROM Hack (Genesis/Mega Drive Hack) : r/3dsqrcodes

Knuckles in Sonic 2 Green Hill Zone by Hivebrain V0.2 (S2 Hack) : Free Download, Borrow, and Streaming : Internet Archive

Hack~ Knuckles the Echidna in Sonic the Hedgehog (Mega Drive) · RetroAchievements

Sally Acorn in Sonic the Hedgehog 2 : r/SallyAcorn

Knuckles the Echidna in Sonic the Hedgehog 2 (Genesis/Mega Drive Hack) : r/ 3dsqrcodes

Knuckles the Echidna in Sonic the Hedgehog 2 (Genesis/Mega Drive Hack) : r/ 3dsqrcodes

Knuckles the Echidna in Sonic the Hedgehog 2 (PS2: PAL) Complete Walk through

Knuckles the Echidna in Sonic the Hedgehog (official build by Sega, existence unconfirmed), Lost Media Archive

Sonic & Knuckles cheat for Mega Drive/Genesis - Level Select (with save state for emulators)

Knuckles the Echidna in Sonic the Hedgehog - Lutris

Play Knuckles the Echidna in Sonic the Hedgehog (Sonic the Hedgehog Hack) - Online Rom

Knuckles in Sonic 2 Green Hill Zone by Hivebrain V0.2 (S2 Hack) : Free Download, Borrow, and Streaming : Internet Archive

Knuckles in Sonic 2 Green Hill Zone by Hivebrain V0.2 (S2 Hack) : Free Download, Borrow, and Streaming : Internet Archive