Disc 4
Please note that the following walkthrough sections are full of spoilers. Do not read ahead if this is your first time playing through the game.
41) Returning to Alexandria

The start of Disc 4, starting in the Black Mage Village and leading into the last side quests available at the end of the game.
42) Memoria

Flying into Memoria on the Invincible (airship) and battling each of the mini-bosses on the way to Trance Kuja.
43) Crystal World

The final pathway on the way to Trance Kuja including the battle against Deathguise.
44) Final Preparations

The last quests that can still be completed prior to reaching the end of the game.
45) Kuja and Necron

The final showdown against Kuja and Necron at the end of Final Fantasy IX and the end of the game.