Sonic 3, Knuckles & Cie - Secrets & Codes .·::·. Planète-Sonic

Video game cheating: A brief history

Sonic Classic Heroes, Wiki

The List of Every Cheat Code in Sonic Origins

Sonic The Hedgehog 3 and Knuckles HYPER SONIC CHEAT CODE/DEBUG MODE/LEVEL SELECT (Sonic Origins)

GameShark Sonic Advance 3 Codes, PDF, Japanese Games

Sonic Origins Plus Cheat Codes by ChelseaKittyGirl on DeviantArt

Sonic the Hedgehog (Prototype) - Hidden Palace

Sonic Origins level select codes and how to find Hidden Palace Zone

Sonic Mania Cheats: Level Select Code, How to Collect Chaos Emeralds, Super Sonic, Special and Bonus Stages

Sonic Origins level select codes and how to find Hidden Palace