Following the exploits of the Summoner Yuna and her guardians as they battle an evil immortal enemy known as Sin, Final Fantasy X is the first title in the franchise to appear on the PlayStation 2. It's also the first game in Squaresoft's popular RPG series to feature voiceovers in addition to written text. Character expressiveness also reaches new heights with the aid of Squaresoft's "Facial Motion System", adding subtle facial expressions to characters in real-time. New side-quests include the underwater sport of Blitzball, and a monster battle arena as well as a redesigned fighting system that mixes classic Final Fantasy elements with a new "Sphere Grid" system.