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Message: <blockquote data-quote="Li Shenron" data-source="post: 6062087" data-attributes="member: 1465">A classic puzzle (re-fluff it appropriately to your circumstances):- you have 12 coins, one of which is fake therefore weights differently- you have a scale with two arms, you can use it to compare the weight of two groups of coins- you have maximum 3 attempts at using the scale to figure out which coin is fakeThe trivial version of the puzzle tells you whether the fake coin is heavier or lighter than the others.The killer version of the puzzle (originally took me an hour or so to figure it out) does NOT tell you that, and the weight difference is not perceivable by any means except the scale in question.My suggestion is to drop this puzzle at the end of a gaming session, and let the players solve it before the next session. If you use the harder version, put the puzzle to block an extra treasure or an optional shortcut, but don't let it totally block their path. Alternatively, you can provide them means (knowledge checks, another puzzle, or whatever they come up with) to figure out if the fake coin is heavier or lighter, thus downgrading the puzzle to its trivial version.</blockquote>