The title, Final Fantasy X, marks the FF transition from entirely pre-rendered backdrops to fully three-dimensional areas, and is also the first in the series to feature voice acting! Final Fantasy X set the course for future games by replacing the Active Time Battle (ATB) system with the "Conditional Turn-Based Battle" (CTB) system, and used a new levelling system called the "Sphere Grid". Set in the world of Spira, where the player must travel with a group of adventurers to battle and one day defeat the evil known as ‘Sin’, you will be captivated by your surroundings and fully immersed into the game.