The gameplay of "Final Fantasy Tactics" differs in several key areas from other titles in the "Final Fantasy" series. Instead of a generic battle screen, with the player's characters on one side and the enemies on the other, encounters take place on three-dimensional, isometric fields. Characters move on a battlefield composed of square tiles; movement and action ranges are determined by the character's statistics and job class. The battlefield also factors in elements such as terrain and weather to determine strategic advantages and disadvantages during clashes. Battles are turn-based; a unit may act when its CT (Charge Time) reaches 100. Charge time is increased once every CT unit (a measure of time in battles) by an amount equal to the unit's speed statistic. When CT reaches 100 or greater, the unit may act. During battle, whenever a unit performs an action successfully, it gains Experience Points (EXP) and Job Points (JP).