Final Fantasy 5 Advance

Music player:
Successfully compete the game to unlock the music player option in the "Extra" menu.

Bestiary:
Save the game after defeating your first enemy to unlock the "Bestiary" option at the main menu. This option shows facts about the different enemies that you have defeated.

Sealed Temple:
Successfully complete the game.

Necromancer job:
Defeat Enuo at the Sealed Temple.

Cloister of the Dead:
Unlock the Necromancer job.

??? Cave:
Collect all twelve legendary weapons from Kuza Castle.

Cannoneer, Gladiator, and Oracle jobs:
Enter the ??? Cave.