all about the cheat game

Advanced Mode:
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Complete the game once with any character. Select the
Completed Character to open up Advanced Mode.Secret Character:
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Complete the game once with any character. The next time
you create a new file, a new Black Mage character will be
selectable.

SEGA message balloon:
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Sacrifice the S, E, G, and A letters in the Temple of Light
to get the SEGA message balloon.