Sonic the Hedgehog 2-Game Secrets & Tips(Cheat Codes)

Sonic the Hedgehog 2's Biggest Easter Egg and Other References - IGN

Knuckles in Sonic 2, Sonic Wiki Zone

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

Every Cheat Code in Sonic Origins

Sonic the Hedgehog 3 Cheats For Genesis Xbox 360 - GameSpot

Sonic Mania Cheats, Codes, and Walkthrough

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

File:Sonic 2 Stage Select.png - Wikibooks, open books for an open world

Hacking Sonic The Hedgehog 2 (GEN) – Game Genie Hijinx!, Video Game Hacking#

Sonic Origins Plus cheat codes: find Hidden Palace Zone and get Super Sonic - Video Games on Sports Illustrated