> The game data files look like this; encrypted, unreadable text. Fortunately, it turned out that they were encrypted using an xor cipher. This means that we can fairly easily write a script to get a list of questions and answers in human-readable, decrypted form.

I mean, it doesn't much matter how these things are encrypted - since they have to be decrypted to display the questions and answers on-screen, the code and any necessary keys will be present in the game code. You'd only need to reverse engineer the ROM enough to know where the decryption code is, and invoke that code (or reverse it and write a compatible implementation). It just so happens that the encryption is weak enough here that reverse engineering is not required.