As to the dots, I enjoyed this variation from xkcd, where I first encountered it: https://xkcd.com/blue_eyes.html https://xkcd.com/blue_eyes.html It massively

As to the dots, I enjoyed this variation from xkcd, where I first encountered it: https://xkcd.com/blue_eyes.html https://xkcd.com/blue_eyes.html It massively improved our play at Hanabi: https://boardgamegeek.com/boardgame/98778/hanabi https://boardgamegeek.com/boardgame/98778/hanabi Probably would be a useful puzzle for improving your Spades or Bridge game, or any game you play with a partner with limited information. Also, it gets much worse than The Random Native. George Boolos has a variation called "the hardest logic puzzle ever." It goes like this: “Three gods A, B, and C are called, in some order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, B, and C by asking three yes-no questions; each question must be put to exactly one god. The gods understand English, but will answer all questions in their own language in which the words for ‘yes’ and ‘no’ are ‘da’ and ‘ja’, in some order. You do not know which word means which.” There's an ongoing effort out there to make this variation even harder: https://arxiv.org/abs/1206.1926 https://arxiv.org/abs/1206.1926