Final Fantasy IV - Platform: Nintendo DS

Dragoon:
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9999 Score in Kain's minigame.
Easy Max Score on Rydia's Mathemagic Minute
If you're stumped on getting the max score (9999) on Rydia's Mathemagic 
Minute, there is a easy way. When you're about to begin the minigame, 
quickly remember the numbers and close your Nintendo DS screen. It will 
put your Nintendo DS in sleep mode. Write down the numbers you remember 
and solve the mathemagic. After you find your answer, quickly open up your 
Nintendo DS and prepare to copy the answer as fast as you can. Keep doing 
this until you get your max score (9999) and Whyt's Summoner costume at 
the end.

Goblin outfit:
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Clear the main story twice.

Ninja:
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9999 Score in Edge's minigame.

Paladin:
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9999 Score in Cecil's minigame.

Summoner/Black Mage:
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9999 Score in Rydia's minigame.

View Credits:
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In the developer's room in the Dwarve's Castle, inspect the shelf behind 
the doll in the first room to view the credits.

White Mage:
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9999 Score in Rosa's minigame.

Zeromus outfit:
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Complete your Bestiary 100%.