Four friends claim they have been wrongly imprisoned. They are not criminals but mere harmless logicians! The warden says, "If you are in fact logicians I will set you free. But first you have to prove it to me." Can they work it out?
I have seen this puzzle shared in many places. I based my graphic on a widely circulated graphic but I have been unable to determine the original source–if you know it please let me know. The links below are examples of how the puzzle has been shared.
https://puzzling.stackexchange.com/questions/11557/who-will-shout-first
https://puzzling.stackexchange.com/questions/1980/four-prisoners-wearing-black-and-white-hats
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