[Jensson]

I tend to exaggerate my claims a bit, yes. But you exaggerate your claims as well, for example you claim that if it had copied the rules it would be easy to find an example, that isn't true at all. Many examples of plagiarism goes unnoticed for years, until someone who is familiar with the original work points it out. I know examples where the person was found out during his thesis defence, he had plagiarised his entire PhD work from papers in another language and nobody noticed until years later, not even all the peer reviewers of the papers.

So maybe these rules are described in Japanese? Most similar games comes from Japan, Kakuro, Sudoku etc. Would your plagiarism detection method of Googling it find a Japanese source? I doubt it. But ChatGPT transcends language barriers, it can translate to English just fine.