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Janou Touryuumon (雀皇登竜門) is a mahjong game originally released as Janou Touryuumon II for the PC-98 in 1991, followed by Teradrive / DOS/V in 1992. Sega ported it to the Sega Mega Drive in 1993. Despite sharing the same name with the original 1987 game[3] this port appears to be based off of the 1991 sequel, with Sega likely dropping the "II" denotation from the title due to it being the first entry on the platform.