One Piece - Pirates Carnival - Platform: Playstation 2

Unlock Skypiea 1:
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After getting the Grand Line 3 board, make sure that the PS2's time and 
date match the actual date and time. Go to Board Game then go to Password. 
Entered going left to right, and once you reach the 3rd column, go to the 
2nd row. Enter the password Triangle, Circle, Circle, Square, X, Circle, X, 
Triangle, Triangle.

Unlock voice collection:
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Simply play each of the games in Member's Game and the Captain's Game once 
and each of them will unlock the voice collection (you don't have to win 
the game, each game will only unlock one voice collection)

Unlocking more games, new board, and cards:
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Play the board game, and in the end, all the games that you've played will 
be unlocked in the versus mode. This will also unlock new bigger boards, 
and all the cards that appear in the board game will also be unlocked in 
the gallery.