Cheat Codes discovered in Sonic Mania Plus : r/SonicTheHedgehog

Sonic the Hedgehog 2 (1992), A Gamer's Cheat Codes Wiki

Sonic Origins cheats: Level select, debug mode, and more

Sonic Origins achievements still unlock when using cheat codes

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

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

Sonic Mania Cheat Codes (Just like the Old Days) : r/NintendoSwitch

FGC #189 Sonic the Hedgehog 3 & Knuckles –

Sonic the Hedgehog 3 (1994)

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

Sonic Origins cheat codes for level select, debug mode and Super