Sonic - Code Gray is a hack of Sonic the Hedgehog by Jdogg. This hack features new layouts, art, music, and ASM edits. Another feature is "Lights Out Zone", a challenging custom-built level which can be accessed by hitting the "?" monitor. Completion of the zone awards you with an extra life/1200 points and warps you to LZ1.

Hellfire Saga By Hardline Team is a hack based on sonic 3 is part of sonic hacking contest 2021, please consider supporting the team if you like it. Sonic finds his realm transformed, merging with the demon realm to form a nightmarish scape littered with legions of hungry-for-blood demons. Help Sonic to escape from hell and return to his home world!DEMOGeneral credits:Narcologer - Project lead, programming, main game and story concept, some boss and enemy sprites, custom powerupTheBlad768 - Main programming, creating the HAGE engine, some boss and enemy sprites, cutscenes, blood, weather effects, SEGA and title screen implementation, sound driver modification.FoxConED - Hardline team leader, music creation, programming, sound driver modification.mrcat-pixel - Art direction, level design, tileset and background art, sprite art, writing help.VladislavSavvateev - Programming, HardLine screen implementation, sound driver modification, tool programming.AURORA☆FIELDS - AMPS sound driver, programming, moving lava and parallax engine implementation.Gerry Trevino - Composing the main theme.GENATAR_i - Music creation.Ralakimus - Programming, HUD implementation.Hotmilk - Writing.VAdaPEGA - Sprite art.Trickster - Sprite art.Sergey ESN - Sprite art.Nat the Porcupine - Sprite art.Sosocheck69 - Concept artist.ProjectFM - One of the bosses and its sprite art.cuberoot - Programming development tools.N-BAH - Programming development tools.SHooTeR - General help, programming development tools.Solareyn Eylinor - Directing cutscene animation.malamus - Testing and feedback.Vladikcomper - Programming, improved Kosinski, Nemesis alghorithms, Advanced Error Handler.Flamewing - Ultra DMA Queue, improved Kosinski Module alghorithm.Featuring enemies and bosses from:Castlevania (Bloodlines, Rondo of Blood, Dracula X, Symphony of Night, Super ~ 4, Java);Ghosts n Goblins (ARCADE), Ghouls n Ghosts, Super Ghouls n Ghosts;Kid Chameleon;The Legend of Zelda: A Link to the Past;Splatterhouse 2;Demon's Crest;Sparkster: Rocket Knight Adventures 2;Castle of Illusion Starring Mickey Mouse;GS Mikami,which have been edited by sprite artists to fit the game's artstyle where time permitted; additionally, featuring character sprites from:Shinbaloonba - Sonic;Gabriel_aka_Frag - Rouge;Skylights - Tikal;teamhedgehog - Honey;EchidKnux - Death,also edited where possible. (Please excuse the messy placeholders, we're working on it!)Featuring music from:Actraiser;Rusty;Castlevania (Super ~ 4, Portrait of Ruin, Symphony of the Night, Aria Of Sorrow)Elemental Master;Ultimate Mortal Kombat 3;Dragon's Fury;Gerry Trevino;Periphery,covered by our musicians.

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.

Sonic - The Lost Land is a hack of Sonic the Hedgehog for the Sega Mega Drive by Shadow Fire. The game is comprised of 7 levels, each filled with traps and badniks intent on bringing down Sonic once and for all. There is also a special realm consisting of 6 Chaos Emeralds. If you have collected at least 50 rings by the time you finish the level, you will see a giant ring. Jump into it to be taken to the secret realm. A dynamic palette system is set up , making each act load its own palette (à la Knuckles' Chaotix), as well as a dynamic music system, allowing each act to load its own music.

Sonic 1: Return to Homeland is based on sonic 1, This hack features new levels, new art, new music and text editing.Story:Sonic 1: Return to Homeland takes place between the events of Sonic 1 and Sonic 2. Sonic is returning to South Island to check the Flickies are alright. But Dr. Robotnik is still capturing them, so Sonic must stop him.This hack is made by Team LordXernom

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