Famous Trick Donkeys is a puzzle invented by Sam Loyd in 1858, first printed on a card supposed to promote P.T Barnum's circus. P. T. Barnum saw the opportunity to promote his show on this puzzle card and offered ten thousand dollars to Sam Loyd to change the name of the puzzle to "P.T. Barman's Trick Mules".


 Later on, and after Loyd had offered the puzzle to other firms, it was renamed again to "Famous Trick Donkeys", which sold more than 100,000,000 copies. Today The Sam Loyd Company owns the rights to the puzzle and released a commemorative puzzle card in 2016, 145 years after it was first published.

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