Final Fantasy Tactics's remaster was built "by sheer force" due to missing source code

Final Fantasy Tactics: The Ivalice Chronicles director Kazutoyo Maehiro has shared that remastering the PS1 classic took a considerable amount of work, as the original game’s source code no longer exists.
The details:
In a new interview published by Square Enix, Maehiro discussed the challenges of creating the remaster, revealing that most of the issues throughout development arose from the lack of source code that the team had to work with. As a result, the team had to build the remaster “by sheer force.” "There were a number of major challenges, but all of them stemmed from the fact that the master data and source code from the original game no longer existed," he said.
Maehiro explained that it wasn’t a case of the source code being lost, but instead that it was simply not kept as it "wasn't a normal thing” to keep the code following the game’s final release back in 1997. To make matters worse, the original title was first created in Japanese, with localization carried out by simply overwriting data with that of other languages.
In order to create the remaster, the director said that the development team “reconstructed” the code of the original title by analyzing its various versions, but in some cases, had to play the game and “work it out by feel.”
He also explained that the decision to leave out additional content added in its “War of the Lions” PSP re-release was made to make “an experience as close to the original as we could,” and that any changes “would only be a loss for not only fans of the original game, but also those new to the title.”
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