Think this went a bit unnoticed in the community ports of the Sonic 1 2 And CD Decompilations For Wii U + Sonic 1 Forever And Sonic 2 Absolute Mods : r/WiiUHacks

Sonic The Hedgehog in component on Wii Virtual Console : r/crtgaming

Release][N3DS] Sonic 1 & 2 (2013) Decompilation port, Page 4

Sonic the Hedgehog (lost build of cancelled Sega CD port of Sega Genesis platformer; 1992) - The Lost Media Wiki

Sonic CD + 1 + 2 Decomps for Wii U, Page 2

Release][N3DS] Sonic 1 & 2 (2013) Decompilation port

sonic 2 wii u port - The Independent Video Game Community

Release] Sonic the Hedgehog 1 and 2 Decomp Port : r/vitahacks

Sonic the Hedgehog (lost build of cancelled Amiga port of Sega Genesis platformer; 1992) - The Lost Media Wiki

Sonic CD (PC 2011) - I'm outta here!