Passage: Final Fantasy X is a role-playing video game developed and published by Square as the tenth entry in the Final Fantasy series. Originally released in 2001 for Sony's PlayStation 2, the game was re-released as Final Fantasy X/X-2 HD Remaster for PlayStation 3 and PlayStation Vita in 2013, for PlayStation 4 in 2015, Microsoft Windows in 2016, and for Nintendo Switch and Xbox One in 2019. The game marks the Final Fantasy series 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 replaces the Active Time Battle (ATB) system with the "Conditional Turn-Based Battle" (CTB) system, and uses a new leveling system called the "Sphere Grid".

Question: Which Final Fantasy game changed from ATB to CTB?
Final Fantasy X