Sonic 1 Remastered v1.1 and v2 are likely fan-made ROM hacks or remakes focusing on improving the visual and audio quality of the original Sonic the Hedgehog for Sega Genesis. The original Sonic the Hedgehog, released by Sega in 1991, was revolutionary for its time.  The 'Remastered' versions represent iterative improvements, suggesting that the developers are continually refining their work. Version 1.1 would be an update to the first release, addressing bugs or introducing smaller features, while version 2 implies more significant changes. These are independent projects, not official releases from Sega.

Sonic 1 Remastered v1.1

Sonic 1 Random Levels Project