Some problems with an apparently logical solution can suddenly reveal a different angle that poses new challenges
The Island of Blue Eyes (Logic Puzzle)
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Uncle Hugo's Science Fiction Bookstore Uncle Edgar's Mystery
Uncle Hugo's Science Fiction Bookstore Uncle Edgar's Mystery
The Blue-Eyed Islanders Puzzle
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What is the solution to the blue-eyed islanders puzzle aka the hardest logic puzzle in the world? - Quora
logical deduction - Blue eyes riddle: a counter-argument to accepted solution - Puzzling Stack Exchange
What is the solution to the blue-eyed islanders puzzle aka the hardest logic puzzle in the world? - Quora
Epistemic logic and the problem of common knowledge
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