Sonic - Hyper X is a 2004 hack of Sonic the Hedgehog created by Skaarg. It was one of the first Sonic hacks that had all of its music changed. In addition, it also featured modified palettes and layouts. Skaarg had stated that he was going to continue to expand upon his hack, but it seems highly unlikely at this point.

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

A Hack Based on Sonic 1 made By RoxurfaceSonic 1: Contemporary attempts to breath new life into the art, music, layouts, and abilities available in Sonic 1. Minor art changes have been made, mainly those found in the 1.1 version, and other minor details. The palettes have been updated to be more lush and vibrant, and each act has a variance of the original zone. The first act retains the original music, and the other two feature variations akin to Sonic 3 & K and Sonic Mania. The exception is Labyrinth Zone, which for now has the same palette and music across all three acts.Sonic can spindash, peel-out, and wall-jump. With six Chaos Emeralds, he can also transform into Super Sonic. (Though without the seventh emerald, the golden form is replaced by invincibility stars, and the level music continues to play.) To become Super, collect the emeralds and 50 rings and press "C" while in the air. You may also revert back to Sonic's normal form at any time by jumping and pressing "C" again. The form otherwise functions exactly as in Sonic 2. The level designs are left mostly faithful to the originals. However, there are now many new shortcuts and secret areas that can be found, especially when making use of Sonic's new abilities. There are plenty of ramps to peel-out off of, and many tight walls to ascend. Marble and Labyrinth have had the most drastic changes to encourage more of a flow rewarded to skilled play. You can even complete Labyrinth Act 2 without ever entering the water. I issue a challenge to all players: in each stage, there is a 1-Up monitor in a new location (the original placement of the 1-Up monitors has been removed or changed to a different power-up.) I challenge you to find the 1-Up monitor in every stage! Bonus points if you collect every 1-Up in a deathless run!This hack was made using Mercury's ReadySonic, so many of the bugfixes and features from that project are present.The bosses in the original game were already painfully easy, and now Sonic's new moves have the potential to make them laughable. To account for this, the good Doctor's Eggmobile now has more invincibility frames. This makes the boss fights more about rhythm and platforming than just wailing on the machine. This affects only a few bosses, mainly in the first half, but I believe it adds a new layer of depth to the bosses.

Sonic 1: Painto Edition 2 (or simply Sonic: Painto Edition 2) is a modification of Sonic the Hedgehog (16-bit), and the first part of the Paintifisation project, made byPainto maniak. The hack contains many features, and is named 'Panto Edition 2' to separate itself from Painto maniak's previous hack; Sonic: Painto Edition (later renamed Sonic: Christmas Island).

Sonic 2: The Alternate Sprites is a Sonic the Hedgehog 2 ROM Hack which changes some of Sonic's and Tails' sprites, including Super Sonic (however with Super Sonic there is a glitch, which causes crashing after falling from a spring). Credits: The One Musaab - Spriter, Implementing Sprites

Sonic 2 but keep Tails or else is a hack by GT Koopa where you should keep Tails from respawning or else you will recieve a Game Over

Sonic 2 Revamped was a heavy modification of Sonic the Hedgehog 2 created by Irixion. This mod first started out as a layout hack, a test of skill, and what Irixion could do. At the time, it didn't have a name, but after seeking for someone who could help, Tweaker suggested the name Sonic 2: Revamped, and it stuck ever since. It eventually grew into a few close friends helping out, and the project grew into realizing Irixion's vision of the perfect game. After major setbacks and a core crippling incident, the hack was ultimately scrapped.

Sonic 2 SMTP is a hack of Sonic the Hedgehog 2 made by SMTP. The hack is an ASM/Layout hack with a couple of new features.