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From Sonic Retro

Sonic 2 CD is a development name for Sonic the Hedgehog CD which was often referred to in early gaming magazines as an enhanced port of Sonic the Hedgehog 2 (16-bit). When it was thought to be a port of Sonic 2 it was said to have CD quality music and additional levels that the Mega Drive counterpart did not.

It's very unlikely that it was ever a port as some people involved in Sonic 2's development that have been contacted by Sonic fans could not remember a CD port.

Magazine References

These are magazines which refered to Sonic CD as a port of Sonic 2.

Dated Issues

• Supergame (February 1992) - Name mentioned as Super Sonic 2: Escape From Ring Zone.
• SegaPro (April 1992) - Confirmation of Sonic 2 port.
• EGM (August 1992) - Sonic 2 CD shown at Summer CES in Chicago.
• Mean Machines Sega (September 1992) - Mega CD port mentioned by logo.
• Sega Visions (September 1992) - Additional zones mentioned.
• MegaZone (September 1992) - Sonic 2 will be released on MegaCD.
• Video Games & Computer Entertainment (October 1992) - Mega CD port confirmed.
• Mean Machines (October 1992) - Game will be known as Super Sonic and feature deleted levels.
• Mean Machines (October 1992) - Game is once again announced as Super Sonic and also it is mentioned to be near completion. In the end the game wasn't released until September of the following year.
• Mega (October 1992) - Sonic 2 will be released on Mega CD.
• Mean Machines (November 1992) - Super Sonic will have CD soundtrack and extra levels.
• Electronic Gaming Monthly (November 1992) - Sonic 2 description with unused Sonic CD cutscene.
• Electronic Gaming Monthly (December 1992) - Sonic 2 CD is mentioned while showing images from the unused cutscene.
• Mega (January 1993) - The title of the game is still mentioned as Super Sonic. Super Sonic seems to be a pretty popular title in UK magazines.

Undated Issues

• GamePlayers Sega Guide - Sega CD port confirmed.
• SegaZone - Mega CD port of Sonic 2 with time travel mentioned.
• MegaTech - This article confirms that the Sega CD Sonic game isn't a port of Sonic 2.