Sonic and the Secret Extended Edition (previously known as Sonic 1: The Other Extended Edition, not to be confused with Sonic the Hedgehog Extended Edition) is a hack of Sonic the Hedgehog for the Sega Mega Drive/Genesis by Hayate. It was discontinued in August 2008, after Hayate gave up on the hack due to the various bugs it had, but it was picked up again in December 2009.

The idea of this game is that you and another friend of yours selects a character (one being Sonic and the other being Tails) and you both battle it out to try to gain as many hits on Eggman. The catch is that Eggman only gets destroyed when the timer runs down to 0 (unless it's a draw at that time, then, it will wait for another hit). The player with the most hits at the end of the timer, wins! You can also win if the other player dies before the timer runs out. The amount of wins are tallied up on the results screen where you can either retry or change settings.This hack made by redhotsonic

Sonic Boom is a total modification of Sonic 2, created by snkenjoi and iojnekns, along with a wide array of talented contributors. As of the Seventh Annual Hacking Contest, this collective is referred to as SÆGA.

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

Sonic Classic Heroes is a ROM hack for the Sega Mega Drive / Genesis that is the result of a collaboration between flamewing and ColinC10, combining their respective hacks Sonic 2 Heroes and Sonic 1 and 2. It therefore is a single ROM that offers the entire campaigns of Sonic the Hedgehog and Sonic the Hedgehog 2, either alone or together; and enables the player to play as many characters such as Sonic, Tails, and Knuckles. The hack is named due to the ability to control a team of characters, which is reminiscent of the more recent 3D game Sonic Heroes. The hack is built on Sonic 2's engine, which has been enhanced by both flamewing and ColinC10 to have new features. These include: multiple gameplay elements from Sonic 3 & Knuckles, such as element shields and character-specific abilities; the ability to save progress, scores, etc. to SRAM (something rarely implemented in Sonic 2, with the other notable example being Esrael's Sonic 2 Delta); various bug-fixes and improvements to the mechanics of the original games; and many more features, both implemented and planned.