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Very similar to the "Blue-Eyed Islanders" riddle: https://www.popularmechanics.com/science/math/a26557/riddle-...

They should make it clearer in the introduction that there is no overlap between the visible statues from each side.

Funny enough, it was the exact puzzle which I read about on XKCD that allowed me to draw a conclusion for this one so quickly. The trick for these is using shared knowledge and a shared signaling mechanism to deduce overall state at a specific time period.

xkcd calls it the "hardest logic puzzle in the world".

I think this one is a lot harder: http://olivernash.org/2009/10/31/yet-another-prisoner-puzzle...

Much better explanation by Nick Berry: http://datagenetics.com/blog/december12014/index.html

Is this used by some cryptocurrency?

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