Sonic Advance 2 (ソニックアドバンス２, Sonikku Adobansu Tsū) is a 2002 handheld platform video game developed by Dimps and Sonic Team, and published in Japan by Sega, in North America by THQ and in Europe by Infogrames for the Game Boy Advance. The game was released in Japan on December 19, 2002, in North America on March 9, 2003, and in PAL Regions on March 28, 2003. It is the sequel to Sonic Advance, and is based on a modified version of its game engine. Gameplay consists of the player defeating "zones" as one of five unlockable characters, each with their own unique attributes. After each zone is completed, the player faces Doctor Eggman, the story's antagonist, in a boss battle.

Sonic the Hedgehog hack made by By Narcologer fully remade zones: Paradise Coast (GHZ), Border Fort (MZ), Dangerous Pit (LZ) and Robotropolis (SYZ) with new music, layouts, graphics and some new chunks. characters: Sonic, Mighty and Metal Sonic. Sonic can perform spin dash and peel out, Mighty can perform jump dash and double jump, Metal Sonic can only to spin dash but also he can't drown.Because 3 characters (and there will be more in future releases!) are too many for title screen I made a simple character select menu.A lot of new sprites.New Sega logo screen.And lots more!Credits:Programming: Narcologer, Vladikcomper, Sonic2010, EsraelNew level art, new chunks and layouts: NarcologerSprites: Narcologer, The Spriters Resource, SCAA, Lone DevilMusic: Ivan YO, STD, Nineko

Mobius Evolution is a heavy modification of Sonic the Hedgehog for the Sega Mega Drive created by Abyssal Leopard with the help of fellow members. The aim of this hack was initially to be a simple level layout hack, but it eventually acquired new features, such as innovative gimmicks, boss battles and other things the player might discover in gameplay.

Sonic the Hedgehog 2 (Japanese: ソニック・ザ・ヘッジホッグ2, Hepburn: Sonikku za Hejjihoggu Tsū) is a platform video game developed by Sonic Team and Sega Technical Institute, and published by Sega for the Sega Mega Drive/Genesis console. It was released in Japan on November 21, 1992 and in North American and European markets on November 24 the same year. The game is an installment in the Sonic the Hedgehog series, and focuses on the protagonist Sonic the Hedgehog and his friend, a fox named Miles "Tails" Prower, who must stop the series antagonist Dr. Ivo Robotnik from stealing the Chaos Emeralds to power his Death Egg space station.Development of the game began in November 1991, two months later than originally intended, because Sega of America initially felt that it was too soon for a sequel. Both the American and Japanese Sonic Team staff contributed to developing the game; art director Tim Skelly designed the appearance of the game's new 3D Special Stages, which were based on an earlier tech demo created by Yuji Naka. The staff increased the speed of Sonic the Hedgehog 2 in comparison to its predecessor. As with the first installment, the soundtrack was composed by Masato Nakamura.The game was a critical and commercial success upon release, with critics praising it for building upon the original Sonic the Hedgehog game. The game has sold over 6 million copies, making it the second-best-selling game on the console, behind only its predecessor in the Sonic series. Since its initial release, the game has been released in several compilations and download releases for various platforms, which were also generally positively received.