As with Final Fantasy X, an expanded international version was produced for Final Fantasy X-2. This version of the game, titled Final Fantasy X-2 International + Last Mission, introduces two new dresspheres, an additional "Last Mission" at a location called "Yadonoki Tower" and the option of using Tidus, Auron and Seymour from Final Fantasy X — as well as several supporting characters from both games — during battle.

This version was never released outside of Japan, although the English voices were used for the main story in the International version (not in the Last Mission). Due to this change, parts of the Japanese subtitles were changed or altered to fit the voice-overs. This was detailed in the official strategy book for the International version. In 2005, a compilation featuring Final Fantasy X and Final Fantasy X-2 was released in Japan under the title Final Fantasy X/X-2 Ultimate Box.


Unlockables

Colosseum Cup
Speak with Shinra in the Airship to enter the Colosseum.

Aeon Cup - Capture the appointed fiends and raise all them to become the Aeon.

Chocobo Cup - Win Large Hard Cup twice.

Demon Cup - Capture the appointed fiends and raise all their SL and release them.

Farplane Cup - Win all other Cups.

Large Cup - Win Regular Hard Cup once.

Large Cup Hard - Win Large Cup once.

Regular Cuo Hard - Win Regular Cup 3 times.

Sabotenda Cup - Win Large Hard Cup 4 times.

Youth League Cup - Win Large Hard Cup 6 times.

Crimson Sphere
Crimson Sphere 1 - In CH3 when Djose Temple needs your help with fiends, go instead back to Bevelle Underground where you fought Bahamut.

Crimson Sphere 10 - In CH3, go to GuadoSalam and get invited into Logos and Ormi's room to obtain it.

Crimson Sphere 2 - Given to you by Gippal and Nooj after you fall into one of the holes that the fayth made.

Crimson Sphere 3 - Given to you also by Gippal and Nooj after you fall into one of the holes that the fayth made.

Crimson Sphere 4 - Found in Guadosalam inside Chateau Leblanc.

Crimson Sphere 5 - In CH4, go to the engine room of the Celsius when Leblanc is there.

Crimson Sphere 6 - Found in Cloister 0 of the Via Infinito.

Crimson Sphere 7 - Visit the ravine in Mushroom Rock Road in CH2.

Crimson Sphere 8 - Found in Cloister 20 of the Via Infinito.

Crimson Sphere 9 -In CH1, follow Logos and Ormi in Mushroom Rock Road all the way to the ravine.

Unlockable Dungeon
Bikanel Central Expanse - Send a Chocobo to Bikanel. This area will be unlocked in Chapter 5.

Den of Woe - Collect all 10 Crimson Spheres to unlock this area.

Fiend Colony - Send a Level 5 Chocobo to Mihen Highroad.

Ruin Depth - In Chapter 5, send 4 Level 5 Chocobos to Calm Lands and Clasko will tell you about this dungeon.

Via Infinito - In Chapter 5, find Kinderguardians inside Bevelle, the room with Save Sphere. You should see a new portal by them.

Here's the ending cutscene of a great expansion title: