Mania Mod maybe? - Sonic The Hedgehog Sega CD Enhanced/ Sonic 1 Sega CD Version by SPEEDWAY GAMES

Sonic CD Restored 30th Anniversary Edition

Vs. Sonic.Exe/Characters, Funkipedia Mods Wiki

CheatFreak's SCD Restored Tweaks (& Knuckles) [Sonic CD (2011)] [Mods]

The Dreamcast Junkyard: Tech Demo Video: Taxman's Sonic CD Running On Dreamcast

Enhanced Juke Box + Fixes [Sonic Frontiers] [Mods]

Sonic Mania/Unused Graphics - The Cutting Room Floor

Mega-Drive Madness, Funkipedia Mods Wiki

Sonic Mania Classic Edition [Sonic Mania] [Mods]

Sonic the Hedgehog CD (Video Game) - TV Tropes

Enhanced Juke Box + Fixes [Sonic Frontiers] [Mods]

Sega, What do you have against a playable Amy or Metal Sonic? : r/SonicTheHedgehog

S1F Mania-Lite: Expanded [Sonic the Hedgehog Forever] [Mods]