I'd fail the specific example: I don't know how to play minesweeper. :-( And I doubt I'd get a good spec during the interview, since the interviewer would probably leave out all sorts of "obvious" details, since "everyone" knows how minesweeper works.

You'd only fail if you couldn't elucidate those requirements. As the interviewer questions. Test your assumptions. That is part of the point of these sort of questions.