One Piece: Pirates Carnival [GC]

East Blue 2
Get 1st place on East Blue 1.

East Blue 3
Get 1st place on East Blue 2.

Grand Line 1
Get 1st place on East Blue 3.

Unlock Skypiea 1
After getting the Grand Line 3 board. 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 X, A, A, Y, B, A, B, X, X.

Unlock Voice Collections
By completing any Captain game or Straw Hat Member game in VS Mode, you will unlock voice data for that game's captain. Playing Luffy's game will give you Luffy's voice data, playing Kuro's game gives you Kuro's voice data, etc. You do not need to be the person playing the captain to unlock the data.

Effect - Code

Enemy Captain Voices [Voice Data 8-20] - Play a Captain game with that captain.
Straw Hat Crew's Voices [Voice Data 1-7] - Play a Straw Hat Member game.

Note: There are two different Voice Datas for Buggy.