GameShark Sonic Advance 3 Codes, PDF, Japanese Games

Sonic Mania, A Gamer's Cheat Codes Wiki

Sonic the Hedgehog 2's Biggest Easter Egg and Other References - IGN

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

Sonic The Hedgehog 3 and Knuckles HYPER SONIC CHEAT CODE/DEBUG MODE/LEVEL SELECT (Sonic Origins)

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

Sonic Mania Cheat Codes Discovered - Infinite Continues, All Chaos Emeralds, More

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

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

Sonic Origins cheats level select, debug mode, Hidden Palace

Review: Sonic Origins is a tragic example of good classics ruined by greed