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Sega Mega-CD was created in 1992.
Yes. Sega Mega Drive is the Japanese and European name for it, while Sega Genesis is the North American name for it.
There is a game called Alien Storm for Sega Mega Drive.
No. Sega CD game disks can only be played on a Sega Mega Drive with a Sega CD unit attached.
Sega Mega drive