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

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

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

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

Release][N3DS] Sonic 1 & 2 (2013) Decompilation port, Page 3

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

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

Sonic the Hedgehog CD/Glitches, Sonic Wiki Zone

Sonic 1 Forever / Sonic 2 Absolute port? - The Independent Video Game Community

The Android versions of Sonic 1 & 2 have been decompiled and can be played on PC, Page 4

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

Release][N3DS] Sonic 1 & 2 (2013) Decompilation port, Page 3

Super Sonic (lost build of cancelled Sega CD port of Sega Genesis platformer Sonic the Hedgehog 2; existence unconfirmed; 1992-1993) - The Lost Media Wiki

Sonic 1-2 Decompilation Wii Port - The Independent Video Game Community

Sonic 1 & 2 get native ports to both the PlayStation Vita & Nintendo Switch thanks to community efforts!

Sonic 1, 2, and CD Remake Decompilation, Page 9