I`ll tell you another story:
The first ZSNES I`ve had, had some glitches. Chrono Trigger for example. When you reach the techno dome the screen went grey
But! I was desperate, I wanted to play it so bad that I began pressing all buttons (from 1 to 0) and some kind of layer was enabled/disabled and the picture appeared! I was able to continue! It was a marvelous expirience
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Kikaioh! GO!