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

Sonic Gems Collection - Wikipedia

Sonic Mania Cheats, Codes, and Walkthrough

Sonic Frontiers, Cheats & Cheat Codes for Xbox One, PlayStation 5, Windows, and More - Cheat Code Central

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

PS3 Cheats - Sonic 4 Guide - IGN

Sonic the Hedgehog 3 (prototype; 1993-11-03)/Hidden content - Sonic Retro

Sonic 3 & Knuckles - The Cutting Room Floor

Sonic Mania Plus Cheat Codes Discovered

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

Sonic the Hedgehog for PlayStation 3 - Cheats, Codes, Guide, Walkthrough, Tips & Tricks