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

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

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

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

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

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

r/freemediaheckyeah, in one single file (view raw) · GitHub

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

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

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