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How will we ensure that no one cheats? After all, there's only one save file.
It's very simple: if the result is obviously "cheated," I'll detect it, and how I do that is my secret. 😉
I advise against using codes, ArtMoney, etc., in advance.
In short, any player suspected of cheating will have to prove their innocence by describing, day by day, how they played. :D