Unlock 15 Puzzle Mini-Game:
When you're on a boat hold X and repeatedly tap the 'Circle' button to unlock the 15 Puzzle mini-game.


Unlock 'Extra' Option:
Complete the following tasks to unlock 'Extra' at the 'Main' menu' to unlock the corresponding effects.

Unlock Art Gallery (Allows you to view game art that you have unlocked):
Clear the game once.

Unlock Bestiary (Get information on monsters that you have defeated):
Clear the game once.

Unlock Music Player (Play any Background Music from the game):
Clear the game once.

Unlock Time Chamber (Revisit floors of 'Labyrinth of Time' that you have already beaten):
Clear the 'Labyrinth of Time' once.