User blog comment:Myself 123/Myself's Unofficial Sonic Games Timeline/@comment-4220590-20190126205723

Technically, the story is slightly different between Sonic 1 (16-bit) and Sonic 1 (8-bit). In the 16-bit version, Sonic arrives in Green Hill Zone and makes the blossoms bloom, while in the 8-bit version, Sonic comes to the Green Hill Zone, defeats Eggman, and make the pollution around South Island go away.