P.N. 03 - Platform: Gamecube

Unlock Hard Mode:
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Beat the game on Easy or Normal difficulty to unlock Hard Mode.

Unlock alternate ending 1:
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Beat the game on Normal to unlock an alternate ending.

Unlock alternate ending 2:
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Beat the game on Hard difficulty with at least a 'Regular' 
rank to unlock an alternate ending.

Unlock the Blackbird Suit:
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Beat the game on Easy or Normal difficulty to unlock the 
Blackbird Suit.

Unlock the Papillon Suit:
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Beat the game a second time and get a professional rank on 
all 50 trials and in your overall rank to unlock the Papillon Suit.