Team Overload presents, Sonic 1 - Warped World! This hack has undergone a quite a lot of changes since last year, including brand new level layouts, a lot of new music, and some other really cool features that you'll see in game! This year's entry only has 3 playable levels so far, but after completing the demo, you will gain access to the level select, where you can see what is in store for future releases!Story:After the events of Sonic 3 and Knuckles, Sonic lands back on Mobius. But because of his extended use of Super Sonic, he has lost his abilities. The Tornado lands on an unknown area so Sonic goes and explores. He comes across a whole lot of badniks and thinks straight away that Eggman had crashed there. Eggman, who barely made it, set up shop in an abandoned factory and built "Robotic Empire". Sonic, on the other side of Chaos Island, needs to make it through the six zones to destroy the Chaos Extraction Engine in Robotic Empire, and regain some of his lost abilities!Credits:A-S-H - Project leader, main music, main art, level layouts for POZ1, CSZ1, HTZ1FireRat - Sound TestKOOL-ZPOT - Super Peel-OutCaveQuest - POZ3 level layoutMopeDude - HTZ2 level layoutLordXernom - Original Level Select musicEduardo Knux - Labyrinth (8-Bit) music portTeam Overload - Beta-testing, help, suggestions and supportSSRG and Sonic Retro - Various guides and general help

Sonic 1 Alt is a layout hack of Sonic the Hedgehog for the Sega Mega Drive by Ell678. It is notable for sporting barely any ASM edits, with the main focus being on the level layouts. Initial response to the new layouts was positive, though the altered palettes were less well received and so have been reverted for the next release.

Sonic 1 and 2 is a hack of Sonic the Hedgehog 2 for the Sega Genesis by ColinC10, submitted as his entry for the 2010 Sonic the Hedgehog Hacking Contest. In addition to all Zones usually featured in Sonic the Hedgehog 2, this hack first features all Zones from Sonic the Hedgehog (16-bit), which have been ported, resulting in a continuous game experience from Green Hill Zone to Death Egg Zone. Both games' different kinds of Special Stages are available in all regular acts, and they are accessed through their usual method (Giant Rings for Sonic 1's, star post checkpoints for Sonic 2's). The player must beat all special stages from each game, thus collecting 13 Chaos Emeralds, in order to obtain Super Sonic.

Sonic 1 Beta Remake is a Sonic 1 hack created by Mistergambit, first released on September 14th, 2006. This hack has all of the Sonic 1 levels redesigned to look like their prototype counterparts, as seen in various magazine screen shots. This hack also has new objects, such as a functioning Splats, the checkered ball that was scrapped from GHZ, and more. To make it seem more like a genuine prototype, some levels are made to look unfinished.

Sonic 1 Color Contrast is a hack of Sonic the Hedgehog for the Sega Mega Drive/Genesis by TheInvisibleSun. It features new palettes and art, modified zone layouts, audio modifications, and various other special additions.

Sonic 1 Definitive is a hack named by RadiantNexus Team, which seeks to reimagine Sonic 1 by rearranging levels. remixing music, adding features from future games, and readding scrapped ideas in new and interesting ways.Major features:3 acts of reimagined level design, including one act that has yet to be fully reimagined in any other hack.A miniboss.Massive art overhaul all over the place.Music made by ProjectFM and MechaKnuckles.Menus!A custom splash screen.There's been massive engine overhauls as well, including the Sonic 3 level layout format for massive levels, and the Sonic 3 object manager to go alongside this.