Controls: Press A to not die.CW: themes of isolation, mild flashing lights, and visuals that may trigger trypophobia.Created in just 12 days for Halloween 2024, this short ROM hack is all about how much of an eerie atmosphere can be achieved in Sonic 1 by removal alone.Every action carries an immediate, permanent consequence. Collecting a ring, defeating an enemy, finishing a level—each choice causes something in the game to vanish forever. The more Sonic interacts with his surroundings, the emptier the world becomes, leaving him to wander through a silent, desolate landscape. There are no jumpscares, no hyper-realistic blood, and definitely no Sonic.exe—just a quiet, decaying world. Will you keep moving forward, even as everything around you fades into meaninglessness? Or will you look for an escape?Thanks to: ajcox, Chaotic SoFa, vladikcomper, zakku, DeltaWP.S.: Inspired by Spindαsh in Sonic 2 SMS and Half-Life 2: Alone Mod. Also, I would've loved to call this hack Sonic Eraser, but unfortunately that name is already taken. At least it served as a nice palette cleanser after working on Sonic ERaZor 7 for ten months, heh.

Sonic the Hedgehog Genesis (Genesis) is a hack of Sonic the Hedgehog by Xenowhirl which attempts to recreate certain aspects of the Game Boy Advance Sonic 1port titled Sonic the Hedgehog Genesis.

Sonic the Hedgehog: Isle of Magnetic Artifacts is a sonic hack made By Neo Team Kyukyokuis a hack which aims to overhaul Sonic 1 using a Japanese-inspired aesthetic. The main feature of this demo is Blossom Gardens Zone, the resting area of the isolated, star-god worshipping Kuratranos tribe. BGZ is a fast-paced experience littered with swift-acting enemies, height-granting gimmicks, driving music, and advanced graphical effects. This new zone can be traversed with three playable characters: Sonic the Hedgehog, Miles "Tails" Prower, and Knuckles the Echidna. Sonic, in particular, features a set of unique sprites, the dropdash ability, and a new companion: Abbey the Flicky. Abbey can pick up nearby rings and circle potential targets for Sonic, including hidden monitors.Neo Team Kyukyoku MembersAngelKOR64: Character programmingChron D: Music arrangementDeltaWooloo: Level layouts, music arrangement, object ports, programming, sound effectsDaxKatter: Music arrangementDio-ZX: Character art, object artDrag109: Level artfuzzy: Level art, programmingiced t: Level art, object artInferno: Level layoutsInktitious: Level artJerry: Level layoutsKatKuriN: Level artKGL: Level layoutsKurk: Team Leader, level layouts, music arrangement, music compositionManiacShard: Object artNaotoNTP: Object artProjectFM: Creative direction, level art, music arrangement, music composition, programming, story planningRaendom: ProgrammingRivet: Programmingtwo^: Concept artyami: Level layouts, music compositionFormer MembersAmzroSevca: Concept art, story planningGemini0: Former team leader, general art, level layouts, programmingjrm1007: Concepts, object artHaz Rabbit: Concept art, programminglavagaming1: ProgrammingNotQuiteHere: Music arrangementpoly: Logo, music arrangementMr. Gandy: Character artXGSOAP: Character artPlaytestersAccelBladeOfChaosCertainly GlitchyCosmic EternityDaxKatterfengishGGK912Hooded EdgeKCEXEKNIJohnMattyMeara BlanchetteMCTravisYTProfessor RendererPXSleekflash-16Sr ParadoxosoapyyTheInvisibleSunUnusualSeekerResourcesAsuharaMoon: Wind-Up Koi spritesAURORA☆FIELDS: SMPS2ASM and AMPSCartoonsAnimate22: Tails and Knuckles spritesCuckyDev: GHZ ball baseflamewing - Ultra DMA Queue + optimized Kosinski (improved by vladikcomper and MarkeyJester) and Enigma decompression codeLone Devil: Metal Sonic spritesMainMemory: SonLVL and Drop Dash programming guideMarkeyJester: DualPCM and sound testMikel Nash: Sonic 3-style super sonic spritesObserver: Sprite ripsShibaMayo: ShibaSaturn spritessnkenjoi: Flex 2The Eighth Bit: Space Queens MIDITheOneMusaab: Sonic 2: The Alternative Spritestildearrow: FurnaceTeck: Super Mario Land - Ending Theme MIDIvladikcomper - optimized Nemesis decompression codeValleyBell: mid2smps, SMPS Converter, SMPS Research PackVladislavSavvateev: DMF2AMPSAssets From:Capcom no Quiz Tonosama no YabouCave StoryFreedom PlanetHigh Seas HavocMega Man SeriesMichael Jackson's MoonwalkerRistarSangokushi Retsuden: Ransei no EiyuutachiShinobi IIISonic SeriesTouhou Project Series

South Island Adventure is a large scale hack of Sonic the Hedgehog by Hivebrain, featuring Espio the Chameleon. It has new sprites, several new levels, and numerous other alterations.

Valis: The Fantasm Soldier II (夢幻戦士 ヴァリスⅡ Mugen Senshi: Varisu Tsū?), which had a remake done with super deformed characters and released as SD Valis (SDヴァリス Esu Dī Varisu?) on the Japanese Mega Drive and Syd of Valis – a translation mistake as SD means super deformed – on the North American Sega Genesis, is the second title in the Mugen Senshi Valis video game series. Like its predecessor, it is an action platformer.