Enter the following codes as your location in the airship to access hidden areas that contain unique gear for your characters. Note that all codes need to be entered in uppercase as you see below.

Achievements and Trophy Guides should be submitted as a Wiki page. Make sure to only submit this page if you are writing a guide/walkthrough to unlock Achievements. These should include instructions, tips, hints above and beyond what is normally listed in an Achievement list.

To unlock this special Cup, capture the monsters below and allow them to gain at least five levels of EXP. Then release them into the Creature History to complete their Fiend Tales and allow them to become new Aeons.

Enter the following coordinates as your destination to unlock hidden locations. Coordinates are formatted as (X, Y):

To make killing these fiends (You cannot run from this battle, also important if you want 'The End' GG) infinitely easier just equip your girls with Berserker with the Evade & Counter ability unlocked. It may still take a lot of hits to defeat him but your girls will not be hit even once and if they have Auto-Regen unlocked their health with be restored by the end of fight.

Examine the locked door in Guadosalam at least once every chapter, and finish the mission on Mount Gagazet during Chapter 3. If you met both these requirements, you will finally gain access to beyond the locked door when you check it again during Chapter 5.

During the minigame, go below the last waterfall and simply kill all approaching enemies while avoiding conflict with them altogether!

You can prevent Dark Knight characters from taking damage for using the Darkness ability by equipping them with the Ragnarok accessory. This can be earned by catching Rikku as the culprit during the 'Great Mi'ihen Mystery' mission in Chapter 4.

Lend O'aka 100,000 Gil to help pay off his debt in order to receive a permanent discount on anything he sells later on in the game. This includes Hi-Potions, which you will be able to buy for a reduced price of 50 Gil but still sell for the normal price! At this point you can purchase as many Hi-Potions as you can afford, then simply sell them back for a handsome profit.

Right after the Blitzball tournament, you start progressing to slay the Chocobo Eater. I noticed this glitch after I killed him when I rode my chocobo back to the first save outside the city. I don't know if this will work before you slay the boss. I was trying to farm fights so I was going slow, walking back to that shop ahead. I noticed that while fighting the Dual-horn, you can use darkness immediately before using Yuna, then summon the first Aeon you get in the game. (Mine is named Kalessin). If you spam the Special Attack Sonic Wings over and over, the Dual-horn never attacks. Every time you fight, if it isn't him, flee. Since he never attacks, the Aeon is never damaged, and you can repeatedly spawn her and get increased AP for Yuna for using her.
Note : I'm pretty sure you can spam attack with the Aeon, instead of Sonic Wings.
Note : I use Sonic Wings because it's the physically weakest attack, and I'm not sure if more fighting during one battle gives you more AP for said battle.

View the good ending (see Ending Requirements), then start a New Game+ to unlock the Zanarkand Abes as a Blitzball team. Defeat them once in Exhibition to be able to trade them for players including Tidus, who is named 'Star Player.'

Enter the following codes as your location in the airship to access hidden areas that contain unique gear for your characters. Note that all codes need to be entered in uppercase as you see below.

Achievements and Trophy Guides should be submitted as a Wiki page. Make sure to only submit this page if you are writing a guide/walkthrough to unlock Achievements. These should include instructions, tips, hints above and beyond what is normally listed in an Achievement list.

To unlock this special Cup, capture the monsters below and allow them to gain at least five levels of EXP. Then release them into the Creature History to complete their Fiend Tales and allow them to become new Aeons.

Enter the following coordinates as your destination to unlock hidden locations. Coordinates are formatted as (X, Y):

To make killing these fiends (You cannot run from this battle, also important if you want 'The End' GG) infinitely easier just equip your girls with Berserker with the Evade & Counter ability unlocked. It may still take a lot of hits to defeat him but your girls will not be hit even once and if they have Auto-Regen unlocked their health with be restored by the end of fight.

Examine the locked door in Guadosalam at least once every chapter, and finish the mission on Mount Gagazet during Chapter 3. If you met both these requirements, you will finally gain access to beyond the locked door when you check it again during Chapter 5.

During the minigame, go below the last waterfall and simply kill all approaching enemies while avoiding conflict with them altogether!

You can prevent Dark Knight characters from taking damage for using the Darkness ability by equipping them with the Ragnarok accessory. This can be earned by catching Rikku as the culprit during the 'Great Mi'ihen Mystery' mission in Chapter 4.

Lend O'aka 100,000 Gil to help pay off his debt in order to receive a permanent discount on anything he sells later on in the game. This includes Hi-Potions, which you will be able to buy for a reduced price of 50 Gil but still sell for the normal price! At this point you can purchase as many Hi-Potions as you can afford, then simply sell them back for a handsome profit.

View the good ending (see Ending Requirements), then start a New Game+ to unlock the Zanarkand Abes as a Blitzball team. Defeat them once in Exhibition to be able to trade them for players including Tidus, who is named 'Star Player.'