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Ojanko Yakata is an adult mahjong game released by Video System in 1986.
Hidden Developer Credits#
There is a hidden Developer Credits screen in the game. It can be accessed any time while no coins are inserted by pressing I, B, and M at the same time. This also works for Ojanko Yakata 2banken, which is identical in code; only the artwork is different.
See also Chinese Casino, which runs on the same hardware and has a similar developer credits code.
(Source: sudden-desu)