Sonic the Hedgehog 2 Cheats For Genesis GameGear Sega Master System Xbox 360 iOS (iPhone/iPad) PC PlayStation 3 Android 3DS Nintendo Switch - GameSpot

NDS Cheats - Sonic Classic Collection Guide - IGN

Sonic Mania Cheats & Cheat Codes for PC, PS4, Xbox One, and Nintendo Switch - Cheat Code Central

Steam Community :: Guide :: Sonic Mania Plus Secrets & Cheat Codes

Tails' Channel, celebrating 15 years on X: A number of Sonic 3 & Knuckles soundtest features were added in the latest update. @TheOcelot01 recapped all the codes in the list below. #SonicNews

GameShark Sonic Advance 3 Codes, PDF, Japanese Games

Steam Community :: Guide :: Sonic Origins Plus - Codes and Secrets

Sonic Origins 1.04 (Switch's 1.4.0) update released, addresses almost 50 bugs.

Sonic & Knuckles Cheats For Genesis Xbox 360 - GameSpot

Sonic Mania Level Selector Cheat Codes Guide And How To Unlock It

Proto:Sonic the Hedgehog 2 (Genesis)/Nick Arcade Prototype - The Cutting Room Floor