All Bonus Items:
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Collect all 100 Crystals in the game. 96 can be located in the games levels.
However there are 4 hidden very well.

Infinite Mana:
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Enter Sound Options. Select soundtrack. Listen to tracks 7, 3, 1, 5, 8 in
that order. You will now have Infinite Mana once you start a new game.
This code cannot be used with a save file.