Yadonoki Tower
From Final Fantasy Wiki
The Yadonoki Tower (ヤドノキの塔, Yadonoki no tō) is an exclusive dungeon only available in Final Fantasy X-2 International + Last Mission. The tower dungeon is similar to Via Infinito. It has 80 levels in total, and at every 20th level, the player has to fight a boss. On every tenth level, Yuna, Rikku and Paine will have a conversation about what has happened since the end of Final Fantasy X-2.
The Last Mission must be started from a New Game Plus, because what the player accomplished during the normal game affects what is said in the cutscenes on the floors. For example, if the player had gotten the Good Ending of the game, Yuna will talk about how life with Tidus is.
Moving and battling in the tower is done differently from the rest of the game. Everything is turn-based, similar to Chocobo's Mysterious Dungeon. Fiends appear on the map, the player chooses their action (which can be moving, changing Dresspheres etc.), then the fiends will take an action. Finding an elevator will allow them to go up to the next floor.
Once the 80th Floor is reached, a fight with Major Numerus, a boss that is possibly even stronger than Trema, ensues.
If the file used during the Last Mission playthrough is 100% file, then an unlockable video will become viewable through the main menu.
