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  2. 14 Visual Brain Teasers and Puzzles That Will Leave You ... - AOL

    www.aol.com/lifestyle/14-visual-brain-teasers...

    In the 1950s, humor writer Roger Price became famous for creating a new type of visual puzzle called “Droodles.” These Droodles were cartoon-y line drawings of abstract images, and readers ...

  3. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    8) 9 + 9 + 9 -2 = 25 + 2 -2 (adding -2 to both sides of the equation to cancel the +2 on the right side, which means the bellhop returned the tip or gave a discount of $2) 9) 9 + 9 + 9 - 2 = 25 10) 27 - 2 = 25 11) 25 = 25. The puzzle should subtract the bellhop's tip from the $27 rather than add it.

  4. Riddle - Wikipedia

    en.wikipedia.org/wiki/Riddle

    A riddle is a statement, question or phrase having a double or veiled meaning, put forth as a puzzle to be solved. Riddles are of two types: enigmas, which are problems generally expressed in metaphorical or allegorical language that require ingenuity and careful thinking for their solution, and conundra, which are questions relying for their effects on punning in either the question or the ...

  5. 15 Viral Riddles and Brain Teasers That Will Leave You ... - AOL

    www.aol.com/lifestyle/15-viral-riddles-brain...

    The post 15 Viral Riddles and Brain Teasers That Will Leave You Stumped for Days appeared first on Reader's Digest. Take a stab at these brain busters (including some tricky viral Facebook riddles ...

  6. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let's Make a Deal and named after its original host, Monty Hall. The problem was originally posed (and solved) in a letter by Steve Selvin to the American Statistician in 1975.

  7. KenKen - Wikipedia

    en.wikipedia.org/wiki/KenKen

    A simple KenKen puzzle, with answers filled in as large numbers. KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto, [1] who intended the puzzles to be an instruction-free method of training the brain. [2]