Answer to Puzzle #39: Google Puzzle. 100 Prisoners In a Line Survival Strategy Executioner
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Prisoner's Hat Puzzle - Think Witty
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New Scientist puzzle #31: Three hats | New Scientist
Four prisoners wearing black and white hats - Puzzling Stack Exchange
4 hats puzzle. Sorry if it has been on here before, it's old but it's good. - Album on Imgur
