SC Cheats & Glitches: Sonic 2 - Debug, Level Select & Super Sonic

Sonic The Hedgehog 2 cheat for Mega Drive/Genesis - Level Select (with save state for emulators)

Sonic the Hedgehog 2 (16-bit)/Hidden content - Sonic Retro

Gamers go wild for Sonic Origins Plus cheat codes – Hidden Palace Zone, Super Sonic and more

Sonic the Hedgehog 2 (Genesis) - Super Sonic Cheat

Xbox 360 Cheats - Sonic 4 Guide - IGN

Sonic the Hedgehog 2 ROM Download - Sega Game Gear(Game Gear)

Non-Jailbroken Hack] Sonic The Hedgehog 2 Classic v4.7.2.4 +1 Cheat [ Free I-AP ] - Free Non-Jailbroken IPA Cheats - iOSGods

The List of Every Cheat Code in Sonic Origins

Multiple Cheat Codes For Sonic Mania Have Been Discovered

Retrospective – Sonic the Hedgehog 2 – The Reformed Gamers