There are several secret locations that can be discovered by searching the map or by unlocking them with passcodes.

In order to unlock Auron's other Overdrives, you must locate the spheres left behind by Jecht, Braska and Auron during their pilgrimage.

In order to understand the Al Bhed language, you'll need to find the primers scattered all over the world. Each one translates a different letter of the alphabet.

You cannot go back for primers I and XIX, XX, XXI, and XXII so be sure to pick them up the first time.

To reach the Remiem Temple, you must be riding a chocobo. Near the south entrance to the Calm Lands, there is a cliff on the right that you can jump off with your chocobo. Go through the narrow passageway to reach the temple.

There are several things to do here. If you go inside the temple, you'll find Belgemine who will challenge Yuna to a summoning battle. After the first time you fight her here, she'll give you the Aeon's Soul whether or not you win.

Behind Belgemine is the Chamber of the Fayth. You must have the Flower Scepter and Blossom Crown to break the seals. Inside you will receive the Magus Sisters.

You can also do a chocobo race by talking to the chocobo on the left and then the one on the right. Try to touch as many chests as possible while avoiding the colored poles. The first time you win, you'll receive the Cloudy Mirror. Thereafter, you can receive other prizes depending on how many chests you touch without hitting the poles.

You must obtain the Cloudy Mirror first by going to the Remiem Temple and winning the chocobo race there. Once you have it, go to Macalania Woods - South and talk to the boy and his mother near the Save Sphere.

Go right and then north to the campsite and speak to the man on the right. Tell him where his wife and kid are and then return to where you found them.

Speak to the mother and father twice and then head up the shining path. When you come to the fork, head north to find the boy standing in front of a large globe. Examine the globe to have it turn your Cloudy Mirror into the Celestial Mirror. You will now be able to open the chests containing the celestial weapons.

At the Thunder Plains, you can get prizes at the rest area for dodging the lightning strikes outside. The will be a flash just before the lightning strike during which you must press [X] to dodge.

You can also obtain a couple prizes for the number of times you are hit by the lightning.

One strategy is to equip some armor with No Encounters and then find one of the blackened pits on the Thunder Plains. The lightning strikes there more often and in a regular pattern, making it easier to anticipate and rack up the dodges quicker.

There is a section on Bikanel Island that is protected by a sandstorm. It just happens to be the Village of the Cactuars and in order to get in you must find and defeat the 10 cactuar guardians.

To start the sidequest, examine the stone with the cactuar symbol on it to the south of the village. You'll get a series of clues to the location of the guardians. Once you find them, you'll play a little mini-game where you must sneak up on the cactuar while its back is turned. If you reach them before the time limit expires, you'll have to fight them. They won't run away, but they will use 10,000 Needles on you a lot. For winning the battle, you'll receive a sphere named after the guardian cactuar. If you don't reach it within the time limit, you'll get a Sphere del Perdedor instead. Either way, you must return to the stone each time to place the sphere in it and receive the next clue.

After you put the last sphere into the stone the whirlwind protecting the village will dissipate, allowing you to enter. Inside the village are two chests, one has the Mercury Sigil and the other has a prize dependant on how many named spheres you obtained from the guardian cactuars.

Head north and dive into the water. In the south end of the pool is a hidden chest with the Onion Knight in it (only obtainable if you already have the Celestial Mirror).

When you are ready, head towards the underwater temple. When you reach the entrance, you'll have to fight Geosgaeno. Since the fight is underwater, you'll only have Tidus, Wakka and Rikku for the fight.

When you reach the Antechamber inside the temple, check the left and right sides for 4 Mega Phoenixes and a Megalixir. Now stand in front of each of the statues to activate them. They will only activate if you have obtained the corresponding treasure from the other temples. Once all the statues have been activated, you are able to enter the Chamber of the Fayth and obtain Anima.

The Omega Ruins are unlocked via the Airship Secret Locations sidequest. Once you have unlocked it you can enter and attempt to complete it. This is perhaps the hardest area in the game, so make sure you are well prepared.

The first part of the dungeon is a maze of tunnels with various rooms with treasure chests scattered throughout. It doesn't matter what order you open the chests in, you will always receive these prizes in this order:

1. Lv. 4 Key Sphere
2. Defending Bracer
3. Turnover
4. Lv. 3 Key Sphere x2
5. Defending Armlet
6. Friend Sphere
7. Lv. 4 Key Sphere
8. Phantom Ring
9. Cactuar Wizard
10. Warmonger
11. Teleport Sphere x2
12. Warp Sphere x99

Sometimes when you open a chest, instead of the prize you'll have to fight a battle with a Mimic (A)/ Mimic (B)/Mimic (C)/Mimic (D) and a Zaurus. If that happens or if you save, or leave the dungeon, the chest prizes will start over again from the beginning.

In the rear left of the dungeon is a room where you'll find the Al Bhed Primer XXVI lying on the ground near the back.

Towards the rear right of the dungeon is a room with a floor seal surrounded by pillars. When you enter this room, you'll have to fight Ultima Weapon.

After beating Ultima Weapon, you'll be transported to to a new section. Each time you come to a circular area, you'll enter a battle. Go to the left to fight Gemini (A) and Gemini (B) then 2 Wraiths to get a Friend Sphere.

Go back and head right. The battles are fixed in this order: Varuna, Adamantoise, Master Tonberry, 2 Defender Zs, 2 Demonoliths, 2 Demonolith, 2 Wraiths. After those battles, head north to fight Omega Weapon.

After defeating Omega Weapon leave the cave and then return to where you fought it to pick up a Magic Sphere.

Each character has a legendary weapon that cannot be made through customization. In order to open the chests containing the weapons, you must have already obtained the Celestial Mirror.

Once you have obtained the weapons the only ability they will have will be No AP. In order to unlock each weapon's powers you will need to power them up by obtaining the celestial tokens.

After obtaining the weapons and tokens, return to the place where you obtained the Celestial Mirror and perform the ritual once for the Crest and again for the Sigil for each weapon to unlock its true power.

After obtaining the airship, you can return to the temples you have already visited and enter the Chamber of the Fayth in each to obtain some very valuable items.

On the right side of the Calm Lands you'll find the Monster Arena. Here you can buy weapons that will allow you to capture monsters to be sent here. Once you catch them, they are available for you to fight anytime for a price. The owner will create his own unique monsters for you to fight after you have caught certain combinations of monsters for him.

Area Creations

These are unlocked by capturing at least 1 of each fiend listed for that area.

Once you have completed any 10 of the Areas, the owner will give you the Mars Sigil.

Species Creations

These are unlocked by capturing a certain number of fiends of the same species.

Original Creations

These are unlocked by a variety of things.

After defeating Nemesis you will receive the Mark of Conquest from the owner.