Topic on Talk:Rigged Riddle
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One could argue that they both count as the same example, Norse Mythology, Whoever added the section to the page certainly thought so, and I'd be inclined to follow that reasoning. we do the same with more modern works - or, at least, I do the same with more modern works.
And quoting from the New Tropes Checklist: "the Mods won't launch their own trope candidates without at least ten"