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I love this puzzle!
Do you know the one with the island with 50 blue-eyed and 50 brown-eyed inhabitants (±1), none of whom know their own eye colour? I think that one is a close second for me...
Yup, that one's also great, but I feel people know it by now, whereas this one is still new to people.
How about the one where all the prisoners yell out their hat color at the same time? (They can all see each other)
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