Sonic Origins level select codes and how to find Hidden Palace

Sonic Classic Heroes, Wiki

Sonic the Hedgehog 3 Cheats For Genesis Xbox 360 - GameSpot

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

15 Best Video Game Cheat Codes of All-Time

FGC #189 Sonic the Hedgehog 3 & Knuckles –

Sonic the Hedgehog 3 (1994)

Let's Play Sonic 3 & Knuckles [Bonus (1/2)]

Proto:Sonic the Hedgehog 2 (Genesis)/Nick Arcade Prototype - The Cutting Room Floor