Cheat Codes discovered in Sonic Mania Plus : r/SonicTheHedgehog

Sonic Gems Collection - Wikipedia

Cheat Codes - Sonic the Hedgehog 2 (Megatech) - Sonic Retro

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

4 Steps to Use Cheats in Sonic Mania Plus - KeenGamer

Knuckles the Echidna in Sonic the Hedgehog 2, A Gamer's Cheat Codes Wiki

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 the Hedgehog 3 – Hardcore Gaming 101

Sonic Origins Plus Cheat Codes by ChelseaKittyGirl on DeviantArt

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