SC Cheats & Glitches: Sonic 3 & Knuckles - Debug & Level Select

Sonic Mania, A Gamer's Cheat Codes Wiki

Sonic the Hedgehog (1991), A Gamer's Cheat Codes Wiki

Sonic Origins cheats: Super Sonic, level select, and more

The List of Every Cheat Code in Sonic Origins

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

All Sonic Origins Cheat Codes: Level Select, Debug and More - Prima Games

I got the Sonic 3 November 3rd Proto running on the Wii! (or

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

Sonic Origins level select codes and how to find Hidden Palace