From Sonic Retro
The Sonic 2 Beta Wiki
Welcome to Sonic 2 Beta Wiki. This project is the updatable version of The Sonic 2 Beta Page, the site dedicated to the archival and research of prototype versions of SEGA's video game Sonic the Hedgehog 2 made for the Sega Mega Drive/Genesis. Much like a movie, a video game undergoes heavy "editing" before shipping, and significant amount of data is stripped due to time or space constraints. In the case of Sonic 2, several zones were completely cut from the final version. For years, questions have been asked regarding the staggering discrepancies between Sonic 2 and old magazine preview screenshots. Gamers could only dream of being able to play the lost levels first-hand ― until the binary image of Sonic 2 Beta surfaced on the Internet in late 1998... [ more about how the prototypes reached the public ]
In addition, the contents of this project will be used to periodically update the main static Sonic 2 Beta Page website as more information is found and elaborated upon.