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Sonic Origins: How To Access Level Select

Sonic The Hedgehog 2 cheat for Mega Drive/Genesis - Level Select (with save state for emulators)

Sonic the Hedgehog 2 Cheats For Genesis GameGear Sega Master System Xbox 360 iOS (iPhone/iPad) PC PlayStation 3 Android 3DS Nintendo Switch - GameSpot

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

Sonic the Hedgehog 2 (Genesis) - Super Sonic Cheat

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

Xbox 360 Cheats - Sonic 4 Guide - IGN

Sonic Mania: How To Access Level Select

Sonic Mania Cheats: Level Select Code, How to Collect Chaos Emeralds, Super Sonic, Special and Bonus Stages

Every Sonic The Hedgehog game ever and in what order to play them - Meristation