The project would be temporarily cancelled in 2008 for three days, although it took several months for him to reveal it. In 2007, the game was ported to the Sega CD to take advantage of its expanded storage and CD audio capabilities version 3.5 was the last Genesis build made, which was leaked in 2007 by a disgruntled dev, however re-released for Steam.

The project was originally lead by Dustin Wyatt, known online as Tweaker or Sonic Tweaker, but following the release of evidence of pedophilia and bestiality, Sonic Tweaker was removed from the team in 2012(Need more proof.) with Simon Thomley, known online as Stealth, taking over as the leader.

The hack has gained notoriety for its sheer amount of content compared with the original, and is one of the few known Sonic ROM hacks to make its way onto cartridges in Russia. In 2016, it was announced by the project leader Stealth that Megamix had officially been cancelled due to the rest of the team leaving the project for personal reasons and other projects, although he stated that he intends to bugfix the last build and release it alongside the source code Stealth would later go on to be a developer for the official Sonic game Sonic Mania, released in 2017. The latest stable release was on June 30, 2007, referred to as release 3.0 an unstable version titled 4.0b was released on August 13, 2008, and another later build unofficially titled 5.0a was released by Team Megamix officially in 2014, however this builds actual release dates far back to 2011, due to it being leaked.

The game takes place 15 years after the events of the original Sonic the Hedgehog with Eggman back on South Island with a Chaos Emerald, with Sonic trying to stop him once again. Sonic the Hedgehog Megamix (commonly shortened to Sonic Megamix or Sonic 1 Megamix) is a 2005 overhaul ROM hack of 1991's Sonic the Hedgehog for the Sega Genesis, developed by Team Megamix the game was first initially released on May 31, 2005, as part of the 2005 Sonic Hacking Contest, with updates in the following years.

Sonic megamix 5.0 download