Hint - Call Me Ninja
In order to acquire the Ninja class -- considered to be the strongest class of them all -- you need to go to Eureka (a sidequest area found in the first floor of Sylx Tower) and go all the way through it. When seeing the last teleport (the one who usually takes you to an area with stores), turn all the way left and you will see a floating staff. By touching it you'll fight Scylla, who gives you this class, when defeated.

Glitch - Duplicate Magic Spells
Glitch - Duplicate Magic Spells Jeopardizes saved data on cartridge. Use with discretion. Unverified.

1. Open the menu during "walkabout mode" (i.e., not in a battle).

2. Select Magic and go to any character and select him using the A button. Note that this character, if he or she has magic existing already, may have his spells overwritten if you carry through on this glitch.

3. Go select Trade on the magic menu and highlight a character with the magic you want to duplicate, but do not push the A button. Instead, after highlighting the target character, press the B button to cancel the "trade command".

4. Once back on the first character you chose, select the "Remove" command and move your cursor to the level and space of magic you wish to duplicate from the second character you had highlighted before. You will get the error message, but you are removing the magic that you don't have (duplicated magic).

Glitch - Duplicate Consumable Items
Glitch - Duplicate Consumable Items Jeopardizes saved data on cartridge. Use with discretion. Unverified. All useable items (not weapons/armors/magic) can be duped using this method, as mentioned,

1. Open the menu during "walkabout mode" (i.e., not in a battle).

2. Select "Items" and put the item you want duplicated in the top left corner of the item list.

3. Engage in a random battle. During battle, select the item command for any character.

4. Your cursor should be at the very top left of the item box (and on the item you have placed there). Press UP and A at the same time. This should briefly take you to Weapon and Shield lists. If you see this, the code has worked after you hit the B button. Go to your inventory and you will notice that the item quantity has been added by one. You may do this for any item that is stackable.

Unlockable DS Secret Dungeon
Unlockable DS Secret Dungeon Unverified. DS version has a secret dungeon that is accessed after the following is performed.

1. Send a total 7 emails to another PC (one at a time or several at once) using Mog Net.

2. Send 4 emails using Mog Net to the NPC "The 4 Elderly".

3. Send 4 emails to King Arusu. After reading the fourth email, you'll unlock a quest.

4. Go ride on the airship that can go underwater.

5. Head for the floating island and once it appears on the screen, travel cardinally south.

6. You will eventually see a shadow in the waters. Enter it to enter the submarine cave.

7. You will meet the secret boss. This boss is notorious and mean. It does a total of four attacks per round and uses Meteo.