Sega Master System / Mark III / Game GearSG-1000 / SC-3000 / SF-7000 / OMV
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Finish the game, and at the end of the credits, wait for the message Presented By Sega to appear. Then, press + to make the Sound Test appear.
Presented By Sega
See the main page for Y's: The Vanished Omens / Ys (イース)