Have that indefinable spark that makes a puzzle awesome: Like a situation that seems familiar, requiring unfamiliar thought ….Actually have an answer: Crank questions will not be appreciated! You can post the answers/hints in Rot-13 underneath as comments as on MO if you fancy.Not be too hard: Any level of difficulty is cool, but if coming up with an answer requires more than two sublemmas, you are misreading your audience.Note: there is a happy medium between this and trig substitutions. Be mathematical (as much as possible): It's true that logic is mathematics, but puzzles beginning ' There is a street where everyone has a different coloured house …' are tedious as hell.Anyone found posting the liar/truth teller riddle will be immediately disembowelled. If you saw that hilarious scene in the film 21, where Kevin Spacey explains the Monty hall paradox badly and want to share, don't do so here. Not be widely known: If you have a terribly interesting puzzle that motivates something in cryptography well done you, but chances are we've seen it.Not every puzzle-based answer that pops into your head will qualify as a good puzzle-to do so it must Okay, so in order to make this question worthwhile (and not a ten-page wade-athon through 57 varieties of the men with red and blue hats puzzle), we are going to have to impose some limitations. Mathematicians and puzzles get on, it seems, rather well. Indeed most puzzles (cryptic crosswords aside) are somewhat mathematical (the mathematics of Sudoku for example is hidden in latin squares). To a certain extent, any piece of mathematics is a puzzle in some sense: whether we are classifying the homological intersection forms of four manifolds or calculating the optimum dimensions of a cylinder, it is an element of investigation and inherently puzzlish intrigue that drives us.
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