Sonic Next Genesis a hack of Sonic the Hedgehog inspired by a the 2006 game Sonic the Hedgehog but mostly contains custom content.Credits:RedHotSonic - Sonic 3K's Priority Manager in Sonic 2MarkeyJester - 128 Variation of Disassembly, Background Deformation Code, ASM GuideHiveBrain - Sonic 1 DisassemblyMercury - ReadySonicvladikcomper - Background Deformation EngineStealth - SonED2MainMemory - SonLVL and related programsXenowhirl - SonMapED, Sonic 2 Disassemblysnkenjoi - FlexTornado - Water Guide, Sonic 3 Sound Driver in Sonic 1 TutorialDemonFox - Caterkiller Fix for 3K's PriorityMoDule - Sonic 3K's Priority Manager in Sonic 2shobiz - Sonic 3K's Ring Manager in Sonic 2Sonic master and hitaxas - Splash Screen TutorialsKram1024 - Sonic 3K's Sound Driver in Sonic 1ValleyBell - SMPS Researchflamewing - SMPS2ASMDolphman - Genesis-style Sonic Advance badnik artx\\\_justicehunter\\\_x - Silver spritesDamien - Shadow SpritesThe creators of all the Sonic 1 and 2 Sonic Retro SCHG and SSRG tutorialsSSRG and everyone on itPeople who contributed art to The Spriters ResourceMy cat Nicole for sitting with me while I worked on thisAnd many other people I likely forgot to credit

Sonic 1 Pixel Perfect is a ROM hack of Sonic the Hedgehog for the Sega Mega Drive / Genesis by JcFerggy and NovaWizard. The hack features new extended layouts and art, custom loops and tubes, dynamic palettes for the acts, and a complete new Green Hill Zone layout (with edited boss) as of the first beta release.

Sonic the Hedgehog Spinball, or Sonic Spinball (ソニック・スピンボール Sonikku Supinbōru?), is a pinball video game in the Sonic the Hedgehog series. It was originally released for the Sega Mega Drive/Genesis in 1993 and later ported to the Sega Game Gear and Sega Master System in 1995.The term "Spinball" is a portmanteau on pinball and "spin dash", a move Sonic performs. It, along with Dr. Robotnik's Mean Bean Machine were the only two Sonic games released to use characters and elements from the Adventures of Sonic the Hedgehog and Sonic the Hedgehog cartoons.

Sonic the Hedgehog (ソニック・ザ・ヘッジホッグ Sonikku za Hejjihoggu?) is a platform video game developed by Sonic Team and published by Sega for the Sega Mega Drive/Genesis. First released in North America, Europe, and Australia on June 23, 1991, the game is the first installment in the Sonic the Hedgehog series, chronicling the adventures of the titular character in his quest to defeat the series' antagonist Dr. Robotnik. The game's story focuses on Sonic's efforts to stop Dr. Robotnik's plans for world domination, release the animals Dr. Robotnik has trapped, and collect six magical emeralds known as the Chaos Emeralds.Development of Sonic the Hedgehog began in 1990, when Sega ordered its AM8 development team to develop a game featuring a mascot for the company. After a hedgehog was decided on as the main character, the development group was renamed Sonic Team.Sonic the Hedgehog received positive reviews from critics, who praised the game's visuals and its sense of speed. It was commercially successful, increasing the popularity of the Mega Drive/Genesis and establishing Sonic the Hedgehog as the company's mascot. Its success led to the development of subsequent games in the Sonic the Hedgehog series, as well as the creation of a media franchise of spin-off products featuring the character.