Unlock Sound Test:
Beat Final Fantasy 1 and 2 once to unlock a sound test.

Secret Dungeons:
Defeat the four fiends to unlock each new dungeon. Each features random maps, exclusive items, and bosses from other Final Fantasy Games. I recommend beating all four fiends before venturing into the dungeons.

Earthgift Shrine - Defeat Lich. Located near Temple of Chaos.
Hellfire Chasm - Defeat Marilith. Located in the Dragon Islands.
Lifespring Grotto - Defeat Kraken. Located near the canal by Melmond.
Whisperwind Cove - Defeat Tiamat. Located in the rivers near the Ice Cave.

Here lies Link:
In Final Fantasy I when you visit Elfheim, press A on the left most tombstone behind the inn. It will say "Here lies Link." Link being the famous star of the Legend of Zelda series.

Homestarrunner.com Reference:
In Hellfire Chasm, on the floor that has lots of NPC's blocking your path, one of them tells you, "This is private property. Trespassers will be burninated!"

Ride a Chocobo:
In Final Fantasy II, directly South of Kashuan Keep is a forest, and within the forest is a small patch of grass. Walk over the grass to enter the hidden Chocobo's Forest, a large field of grass. If you find a Chocobo in it, you can ride it.

Final Fantasy 9 refrence:
In the Water shrine, go in it and find the area with all the dancers. Talk to alot of them and you should hear some say something about the Tatarus theater and the "I want to be your canary" play which is all Zidanes theater group in FF9!

Trance Kuja FF9:
Reference In the whisperwind cove, on the floor where you must find a certain boy, there is one boy that says he wants a "Trance Kuja" doll.

Final Fantasy I & II Secrets:
Tile Game:
In FF II there is a match-the-faces tile game that gives items and cash prizes. When you are on the ice sled, hold A and keep pressing B to bring up the game.

FF1 Mini Game:
While on the ship, hold down A and keep tapping B. Soon, a sliding tile minigame will appear. The aim of the game is to put the numbered tiles in order from 1 to 15. If you do well, you gain items and money!

Soul of Rebirth:
After you've completed the main story, an additional option will appear at the Final Fantasy II main menu. Select Soul of Rebirth to begin a new journey...

Peninsula of Power:
This 2x2 piece of land is Northeast of the town of Pravoka. From Pravoka, head South to the mountains, then East until you see a dock, then from there, head North. The monsters you can find is a whole lot stronger then ordinary monsters around. Other then leveling up skills quickly, the equipments the monsters drop is the best you can get for quite a while; Winter Wolf drops the Ice Shield! Minotaur Zombie drops the Great Axe!

Toad Memory Game:
In FF2, if you level up the Toad spell to lv16, the faces on the memory game change to toads. Also, the prizes will change, yielding Genji equipment for many rankings, and a Masamune for a no-miss game.

Peninsula of Power 2:
In Final Fantasy 2 go down from the first town to a peninsula and move around till a foe come out. There you fight very hard foes like Brains. You get major stat boosts if you survive. Great if you started a new file.

FFII Easy HP and Stamina up:
Simply attack yourself one or two times, and your HP and/or stamina will be raised after almost every battle. Im REALLY early in the game and i already have over 1000 HP for each character, and it barely took me any time. As an added bonus, your weapon levels will also be raised.

FFII - Easy weapon skill levels:
Get into a battle with enemies that CAN'T run away, then kill all but one enemy. Equip everybody in the party with two shields (this can be done in the Item menu) and keep holding down the A button for about 30-50 turns. Then equip everybody with the weapons that you would like to level up, and kill the remaining enemy. You will get weapon skill experience in the weapons that you are equipped with at the end of the battle instead of leveling up your shield skill.

Unlimited Super weapons and Items:
Every time you go trough one of the elemental caves you find accessories and weapons that can be used during combat as an item. But the thing is that you can go back and finish over and over those caves tu get an unlimited supplies of Healing Staffs, Lightbringer,Rune Axe and or other powerfull weapons except the ultima weapon unfortunatly. It's long but it's worth it at the end.

Hidden magic vendor (Final Fantasy II):
In the jade passage in Final Fantasy II, there is a Magic seller behind the lowest level of the waterfall. Enter the waterfall by hugging the wall from the right of left, then when you stop, press the talk button.

Quick Exp and Money in FF1:
Within the Ice Cavern, go back to the spot where you found the Levistone. The boss you had to fight, Evil Eye, is still there in infinite numbers, unlike most other bosses. He deals out 3225 Exp and Gil each time! Plus, he's very easy when you're at a decent level. A good offensive person, particuarly Theifs and Ninjas(They strike first), can easily kill Evil Eye in one hit.