This is my modification of Sonic. I changed Green hill, Marble zone, Spring yard, and Scrap Brain there. This is my very first full-length speedrun on Sonic 1. I completed it without bugs, without glitches, and without zips. Enjoy!
Game link: https://www.mediafire.com/file/lq3phhjtzn5ydmh/sonic_by_BadPiggies.bin/file