Unreleased Mega Drive games

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Over the course of the Sega Mega Drive's lifetime, a number of games went unreleased:

Name	Involved Companies	Details
AD2001/Power Ball AD2001	HiCom	Info on this page is all that's known. A prototype has yet to be found.
"Amegedon" Project	??	Info on this page is all that's known. A prototype has yet to be found.
Beyond Zero Tolerance	Technopop	The sequel to Zero Tolerance. Cancelled when Technopop closed down. The copyright holders eventually released a prototype ROM to the Internet.
City Heroes	Samsung	All that's known comes from this Hardcore Gaming 101 article: Developed by the Uzu Keobukseon team and intended for international release; it was cancelled because the then-new South Korean game censorship laws were so confusing that they got lost trying to censor the otherwise completed game. The ROM has yet to be found.
Dando	Treco	Advertised in magazines, but no actual info is known.
Explode Star	NCS	The Japanese release of Trampoline Terror!. Cancelled for unknown reasons. Promotional fliers were distributed before the game was cancelled.
Fire & Ice	Graftgold	Cancelled for unknown reasons. A prototype has yet to be found.
Flash Point	Sega	Cancelled for unknown reasons (presumably for the same reason Tetris was pulled from production after some copies had shipped). A prototype ROM circulates around the Internet.
Halloween Capsule	Softmax??	Info on this page is all that's known. A prototype has yet to be found.
Jim Power: The Arcade Game	Loriciel	Cancelled due to "financial troubles". A prototype ROM circulates around the Internet.
Lobo	Ocean	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.
Ninja Gaiden	Tecmo, Sega	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.
Prince of Persia 2: The Shadow and the Flame	Broderbund	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.
ResQ	Tempest, Psygnosis	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.
Socks the Cat	Kaneko	Advertised in magazines. Cancelled for unknown reasons. A prototype has yet to be found.
Speed Racer	Accolade	Advertised in magazines. Cancelled for unknown reasons. A prototype has yet to be found.
Speedway Pro Challenge	Renovation Products	The planned American localization of Human's 1991 Mega Drive game Fastest 1. Cancelled for unknown reasons. Box scans exist.
Stone Protectors	Kemco, Eurocom, VIC Tokai	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.
Swamp Thing	Microsmiths, Nuvision	Cancelled when Nuvision went under. A prototype ROM circulates around the Internet.
Zombie High	Electronic Arts	Cancelled for unknown reasons. A prototype ROM circulates around the Internet.

Note: the Mega Drive Command & Conquer ROM, long believed to be an unreleased port, is actually an unfinished pirate.