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You guess incorrectly. CODA is only in the latest remake. It did not exist before. Aaaand I got sidetracked.
Really? Well, there are four that I know of. The first one's finished. And, the second is (thankfully) winding down. I hate the Palace of the Dead. If you don't mind spoilers, I've got a tip I discovered for making that second one easier...predictably, I found it AFTER the window to use it had expired. Well, like I said, let me know if you want more info.
Mmm. I doubt there will be many spoilers. That is just extra stuff. Although, I think the CODA is also primarily a way to reply the game using the characters that you unlocked from other routes.
One of the CODA chapters requires you to return to the Palace of the Dead and go all the way to level 115. But, if you get to floor 100 and beat Nybeth before completing the Hanging Gardens, you'll get three Guides to the Palace of the Dead. These guides only work in CODA, but they let you warp to floor 76.
"The object of war is not to die for your country but to make the other bastard die for his." --George S. Patton