Castlevania - Portrait of Ruin - Platform: Nintendo DS

Duplicate Quest Reward:
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Upon completing a Quest, Talk to Wind to open up the quest menu. 
Press A twice. When you hear the "reward" chime, press START to exit 
the quest menu. The quest reward is already given to you, however, the 
quest is uncleared from the list. You can repeat this as many times as 
you want and get the rewards again.

English Voiceovers:
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To enable English voices in the Japanese version of this game, simply 
press 'A' while holding 'L' at any of the main menu choices. Jonathan 
will say "showtime" to confirm the activation.

The Dark Side of Vincent:
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If you take Charlotte as your main character and press UP for about 10 
seconds in front of Vincent, the shopkeeper, he'll make a funny comment. 
Try with and without Jonathan on the screen.

Unlock "Richiter" and "Sisters" mode:
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Start a new game with a different duo!

Unlock Boss Rush Courses 2 and 3:
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Selectable from the Boss Rush menu.

Unlock Hard difficulty:
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You can place a max level cap here too.

Unlock New Game +:
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Start a new game on your clear data.

Unlock Sound Mode:
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Selectable at the main menu.