Final Fantasy X-2 picks up two years after Sin's defeat and was the first direct sequel in the main series. Yuna, now a sphere hunter, teams up with Rikku and the fiery newcomer Paine aboard the airship Celsius, chasing a mysterious recording that may show a lost friend. The tone is lighter and more playful than its predecessor, and the story branches around a Spira divided by rival factions. Battles use a fast Active Time Battle system built around Dresspheres, outfits that swap job classes mid-fight, so a Gunner can become a Black Mage or Warrior in seconds. Missions can be tackled in almost any order, with plenty of side quests, minigames and multiple endings depending on how thoroughly you explore.