FFT 1.3 is a fan-made modification of Squaresoft's game Final Fantasy Tactics for the Playstation and Playstation Portable gaming systems. It greatly increases the difficulty of the game and rebalances gameplay mechanics. 1.3 is not a storyline patch and does not affect the game's plot or character development.
I have not fully finished 1.3 but i will say that this patch does what it's supposed to do. Not only that but the creator is constantly updating this patch with balance fixes and new content for the player to enjoy.