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2. List of impossible puzzles - Wikipedia

   en.wikipedia.org/wiki/List_of_impossible_puzzles

   This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.

3. 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.

4. Bridge and torch problem - Wikipedia

   en.wikipedia.org/wiki/Bridge_and_torch_problem

   The puzzle is known to have appeared as early as 1981, in the book Super Strategies For Puzzles and Games. In this version of the puzzle, A, B, C and D take 5, 10, 20, and 25 minutes, respectively, to cross, and the time limit is 60 minutes. [6] [7] In all these variations, the structure and solution of the puzzle remain the same.

5. 25 Printable Brain Teasers You Can Print for Free - AOL

   www.aol.com/25-printable-brain-teasers-print...

   How many of these brain busters can you solve? The post 25 Printable Brain Teasers You Can Print for Free appeared first on Reader's Digest.

6. Best Brain Training Games: Riddles, Brain Teasers, Puzzles ...

   www.aol.com/75-brain-games-guaranteed-boost...

   Exercise your brain and sharpen your mind (the fun way!) with these 13 types of brain training games. The post Best Brain Training Games: Riddles, Brain Teasers, Puzzles, and More appeared first ...

7. 14 Visual Brain Teasers and Puzzles That Will Leave You ... - AOL

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

   Brain benefits: You might think the only benefit of a movie puzzle is showing off your pop culture IQ, but the truth is, these visual brain teasers help with memory and recall, too. Play Now 9.